Buffers are the solution that resists the change in pH. 1.39 ml of 5.90 M sodium hydroxide must be added to raise the pH to 5.75.
What is Henderson–Hasselbalch equation?Henderson–Hasselbalch equation is used to determine the pH of the buffer by the equilibrium concentration of the acid and the conjugate base.
Moles of acetic acid are calculated as:
[tex]0.480 \times 0.0215 = 0.01032[/tex]
Moles of sodium acetate are calculated as:
[tex]0.480 \times 0.0275 = 0.0132[/tex]
The total number of moles is = 0.02352
Now, using the Henderson–Hasselbalch equation:
[tex]\rm pH = \rm pKa + log \dfrac{[Acetate]}{[Acetic\; acid]}[/tex]
Given,
pH = 5.75
pKa = 4.74
Substituting values in the above equation:
[tex]\begin{aligned} 5.75 &= 4.74 +\rm log \rm \dfrac{[Acetate]}{[Acetic\; acid]}\\\\10.2329 &= \rm \dfrac{[Acetate]}{[Acetic\; acid]}\end{aligned}[/tex]
Solving further:
[tex]\begin{aligned} 10.2329 &= 0.02352 - \rm \dfrac{[Acetic\; acid]}{[Acetic\; acid]}\\\\11.2329\; \rm [Acetic \; acid] &= 0.02352 \\\\&= 0.002093\end{aligned}[/tex]
Moles of acetate is calculated as:
0.02352 moles - 0.002093 moles = 0.021427 moles
Initial moles of acetate were 0.0132, added moles of acetate by the addition of the sodium hydroxide resulted in, 0.021427 - 0.0132 = 0.00822 moles of sodium hydroxide.
Volume is calculated as:
[tex]0.00822 \;\rm moles \times \dfrac{1\;\rm L}{5.90\;\rm M} = 0.00139 L[/tex]
Therefore, 1.39 mL of 5.90M of sodium hydroxide is added.
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please help i have finals coming up!!
Answer:
.475 M
Explanation:
USe periodic table to find mole weight of HCl
H = 1.008 Cl = 35.45 total 36.458 gm / mole
Find the numebr of moles in 52 gm
52 gm / ( 36.458 gm / mole) = 1.426 moles
1.426 moles / 3 L = .475 M
At rest, a person inhales 9. 72 x 10^21 nitrogen molecules in an average breath of air. How many grams of nitrogen gas are inhaled?
The grams of nitrogen gas inhaled are 0.0322816 moles.
What is mass?Mass is the quantity of matter of a physical body.
No. of molecule inhaled by a person is [tex]9. 72 \times 10^2^1[/tex]
Nitrogen is a diatomic molecule, so it will contain 2 atoms.
Number of nitrogen atoms
[tex]9. 72 \times 10^2^1 \times 2 = 19.44 \times 10^2^1[/tex]
1 mole contain = [tex]6.022 \times 10^2^3[/tex]
So, number of moles of nitrogen
[tex]\dfrac{9. 72 \times 10^2^1}{6.022 \times 10^2^3} = 3.22816 \times 10^-^2\\\\= 0.0322816 \;moles[/tex]
Thus, the grams of nitrogen gas inhaled are 0.0322816 moles.
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Consider the alkane below. a six-sided polygon has c h 2 at each corner. which property differentiates this alkane from other classes of alkanes? the shape the types of bonds the number of carbon atoms the number of hydrogen atoms
This particular alkane is distinguished from all the other alknes by reason of the shape of the alkane.
What are alkanes?The term alkanes has to do compounds that have only a carbon to carbon single bond. We have to note that alknaes can be cyclic, linear or branched. All this types of alkanes are easily recognized by shape.
This particular alkane is distinguished from all the other alknes by reason of the shape of the alkane.
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Answer: A) The shape
Explanation:
edge 22 - took the quiz and got it correct
hope it helps <3
50.0 g of nitrogen gas (N2 ) are kept under pressure in a 3.00 L container. If the pressure is kept constant, how many moles of nitrogen gas are present in the container if gas is added until the volume has increased to 5.00 L?
The resultant moles of nitrogen gas that are present in the container is 2.96 moles.
How do we convert mass into moles?Mass of any substance will be converted into moles by using the below equation as:
n = W/M, where
W = given mass of nitrogen gas = 50gM = molar mass of nitrogen gas = 28 g/mol n = 50 / 28 = 1.78 molesFrom the ideal gas equation of gas we know that moles and volume is directly proportional to each other and for this question equation becomes,
V₁/n₁ = V₂/n₂, where
V₁ & n₁ are the initial volume and moles of gasV₂ & n₂ are the final volume and moles of gas.On putting all values, we get
n₂ = (5L)(1.78mol) / (3L) = 2.96 moles
Hence required moles of nitrogen gas are 2.96.
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Why does every chemical reaction require a certain amount of activation energy?
A Energy is released when the reactants begin to react.
B. Energy lost to the environment during the reaction must be replaced.
C. Forming the activated complex requires energy.
D. The products have more potential energy than the activated complex.
E. The reactants have less potential energy than the products.
Answer: C
Explanation:
Which of the following is found in the nucleus of an atom
A) protons and electrons
B) protons, neutrons, and electrons
C) protons and neutrons
Answer: …
Explanation:
What do you think will happen to the ecosystem if all the coral reefs are destroyed?
Calculate the mass percent of a solution prepared by dissolving 17. 2 g of nacl in 149 g of water
Answer:
10.72 %
Explanation:
17.9/(17.9+149)=.1072 = 10.72%
Na2co3 nahc2o4 fecl3 nh4br kclo4 acidic basic or neutral
The state of the compounds are:
Na₂co₃- basic salt
NaHC₂O₄- acidic
FeCl₃- acidic
NH₄br- acidic
KClO₄- neutral
What is the state of the compound?The state of the compound is its acidity, basicity, and neutrality. The compounds are the mixture of opposite elements.
Thus, the state of the compounds are:
Na₂co₃- basic salt
NaHC₂O₄- acidic
FeCl₃- acidic
NH₄br- acidic
KClO₄- neutral
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Na₂CO₃, NaHC₂O₄ and FeCl₃ are basic, acidic and acidic respectively.
Why pH is used for?pH scale is used to define the nature of a substance as acidic, basic or neutral. Value from 0 to 6.9 shows the acidity, 7 shows the neutrality and from 7.1 to 14 shows the basicity.
Na₂CO₃ is basic in nature, as it is formed by the reaction between strong base and weak acid. NaHC₂O₄ is an acid, as in it carboxylic group is present. FeCl₃ is acidic in nature as it is made from strong HCl acid.Hence, Na₂CO₃, NaHC₂O₄ and, FeCl₃ are basic, acidic and acidic respectively.
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What is the acid ionization constant (ka) of an unknown acid if a 0. 030m solution of it has a ph of 2. 946
The acid ionization constant (ka) of an unknown acid if a 0.030M solution of it has a pH of 2.946 is 4.8×10⁻⁵.
What is the relation between pH and [H⁺]?Relation between the pH and [H⁺] will be shown as:
[H⁺] = [tex]10^{-pH}[/tex]
Given that pH of solution = 2.946
[H⁺] = [tex]10^{-2.946}[/tex] = 0.00113 = 0.0012
Let the ICE table for the unknown acid HA will be:
HA ⇄ H⁺ + A⁻
Initial: 0.03 0 0
Change: -0.0012 0.0012 0.0012
Equilibrium: 0.03-0.0012 0.0012 0.0012
Acid dissociation constant will be calculated as:
Ka = [0.0012][0.0012] / [0.03-0.0012]
Value of 0.0012 is very small as compared to the 0.03, so the equation becomes
Ka = (0.0012)² / 0.03 = 0.000048 = 4.8×10⁻⁵
Hence value of Ka is 4.8×10⁻⁵.
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Using this Punnett Square, what percentage of offspring can display the recessive trait?
100%
50%
25%
0% No offspring can display the recessive trait
Answer: 0% No offspring can display the recessive trait
just did the test
many grams of potassium iodide (KI) should be used to prepare 0.600
of a 2.50 M solution of potassium iodide? (The mass of potassium is 39.10 grams
che mass of iodine is 126.90 g).
Atte
1D
Sec
498
118
228
328
evious
Next
The mass of the solute is given by the moles and the molar mass of that substance. In the 2.50 M solution, 249 gm of KI is present.
What is molarity?Molarity and the volume of the solution can be used to give the moles of the solute dissolved in the solution and can be further used to give the mass of the solute.
Given,
Molarity of KI = 2.50M
Volume of potassium iodide solution = 0.6 L
Molar mass of KI = 166
The formula of molarity is given as:
Molarity = moles ÷ volume
The formula of moles is given as:
Moles = mass ÷ molar mass
Substituting moles into molarity as:
M = mass ÷ molar mass × Volume
mass = 2.50 × 0.6 × 166
= 249 gms
Therefore, 249 gms is the mass of KI.
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249 grams of potassium iodide (KI) should be used to prepare 0.600 of a 2.50 M solution of potassium iodide.
Define molarity of a solution.Molarity (M) is the amount of a substance in a certain volume of solution.
Molarity is defined as the moles of a solute per litres of a solution.
Molarity is also known as the molar concentration of a solution.
Given data:
Molarity of the solution = 2.50 M
Volume of solution = 0.600 L
Molarity = [tex]\frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]
Now putting the value in the equation:
2.50 M = [tex]\frac{Moles \;solute}{ 0.600 L}[/tex]
Moles of solute = 1.5
Moles = [tex]\frac{mass}{molar \;mass}[/tex]
1.5 = [tex]\frac{mass}{166.0028 }[/tex]
Mass = 249 gram.
Hence, 249 grams of potassium iodide (KI) should be used to prepare 0.600 of a 2.50 M solution of potassium iodide.
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386,000 sciencetific notation
'
Find the pH of a solution with [H+] = 5.4×10^-2
Explanation:
Here is the solution...hope it helps:)
Which is warmer 20'C or 20K?
Answer:
20C is warmer.
Explanation:
20C is 68 fehrenheit
20K is -423.67 fahrenheit
How many mols of water are produced from 88.0g of methane?
Answer:
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
88.0g ………………….. ………………………..?g
88.0g C3H8 x (1 mol C3H8 / 44.0g C3H8) x (4 mol H2O / 1 mol C3H8) x (18.0g H2O / 1 mol H2O) = 144g H2O
The bronsted-lowry model can apply to bases that do not contain hydroxide ions
The statement that bronsted - lowry model can apply to bases that do not contain hydroxide ions is true.
What is Bronsted - lowry model?
The Bronsted - Lowry theory, also known as the proton theory of acids and bases, is a theory developed independently by chemist Johannes Nicolaus Bronsted and English chemist Thomas Lowry in 1923.
The theory states that as acid is a substance that can donate electrons and bases are those which can accept electrons.
Thus, the statement that bronsted - lowry model can apply to bases that do not contain hydroxide ions is true.
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There are four states of matter, solid, liquid, gas and plasma. In order for matter to change between the different states it must undergo a phase change. Which of the following
phase changes are endothermic?
Answer:
solid liquid and gas
Explanation:
3. 0.050 mol of Ca(OH)2 are combined with 0.080 mol of HCl according to the following equation:
Ca(OH)2(aq) + 2HCl(aq) +CaCl2(aq) + 2H2O(1)
a. How many moles of HCl are required to neutralize all 0.050 mol
of Ca(OH)2?
The number of mole of HCl required to neutralize all 0.05 mole of Ca(OH)₂ is 0.1 mole
Balanced equationCa(OH)₂ + 2HCl —> CaCl₂ + 2H₂O
From the balanced equation above,
1 mole of Ca(OH)₂ required 2 moles of HCl
How to determine the mole of HCl requiredFrom the balanced equation above,
1 mole of Ca(OH)₂ required 2 moles of HCl
Therefore,
0.05 mole of Ca(OH)₂ will require = 0.05 × 2 = 0.1 mole of HCl
Thus, 0.1 mole of HCl is needed for the reaction
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PLEASE HELP ASAP!!!!!
Which statements explain why rocks weather at different rates? Check all that apply.
Softer, porous, or more permeable rocks weather faster than harder rocks.
Rocks in warmer climates weather faster than rocks in colder climates.
Rocks with minerals that dissolve slowly in water will weather faster than other rocks.
The more water present, the faster the rate of weathering.
Rocks that are more permeable are more resistant to weathering.
The correct statements which explain why rocks weather at different rates are: A. Softer, porous, or more permeable rocks weather faster than harder rocks. B. Rocks in warmer climates weather faster than rocks in colder climates. and D. The more water present, the faster the rate of weathering. Hence , Option A , B and D are correct
What is Weathering of rocks ?Weathering can be defined as both the physical and chemical breakdown of a rock into smaller fragments (pieces) called sediment.
Generally, rocks weather at different rates based on the following reasons:
Rocks that are softer, porous, or more permeable in nature, weather faster than harder rocks.Rocks that are located in warmer climates weather faster than those rocks located in colder climates.Weathering is highly dependent on water: the more water present in a rock, the faster the rate of its weathering.Some of the natural phenomenon that influences rock cycle include the following;
Plate tectonic activity.Erosion.Weathering.Therefore , The correct statements which explain why rocks weather at different rates are: A. Softer, porous, or more permeable rocks weather faster than harder rocks. B. Rocks in warmer climates weather faster than rocks in colder climates. and D. The more water present, the faster the rate of weathering. Hence , Option A , B and D are correct
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Answer: A., B., D.
Explanation:
When hydrogen peroxide
decomposes, what mass of
hydrogen peroxide is needed
in solution to produce 1.6 g of
oxygen gas?
Answer
34g
Explanation:
equation:2H2O2 ------------ 2H2O + O2
mole ratio: 2: 2 : 1
RMM of O2 - (16*2) = 32
RFM of H2O2 - (1*2) + (16*2) = 34
1 MOLE O2 - 32g
? - 1.6g
1.6/32 = 0.5 MOLES
0.5*2 = 1 MOLE OF H2O2
I*34 = 34 g
4. how are ions related to the magnetic field of the earth?
Answer:
When ions move over a polar cap of Earth, the changing shape of the magnetic field lines bends the drift path induced by the electric field normal to the magnetic field. The centrifugal acceleration associated with this bending shoots the ions away from the Earth along the magnetic field lines
Explanation:
Climate change.Write a full note on it
Climate change refers to long-term shifts in temperatures and weather patterns. These shifts may be natural, such as through variations in the solar cycle. But since the 1800s, human activities have been the main driver of climate change, primarily due to burning fossil fuels like coal, oil, and gas.
Burning fossil fuels generates greenhouse gas emissions that act like a blanket wrapped around the Earth, trapping the sun’s heat and raising temperatures.
Examples of greenhouse gas emissions that are causing climate change include carbon dioxide and methane. These come from using gasoline for driving a car or coal for heating a building, for example. Clearing land and forests can also release carbon dioxide. Landfills for garbage are a major source of methane emissions. Energy, industry, transport, buildings, agriculture, and land use are among the main emitters.
Nowadays the ice is melting more rapidly, this can cause a rise in water/ocean. The forests are drying up faster, species populations are declining rapidly. So we must take action before it is too late.
Thank you.
HAVE A NICE TIME
stay safe
Which two elements, in looking at their atoms, have a total of 51 protons between them?
Magnesium and Aluminum
Lithium and Scandium
Tin and Hydrogen
both A and B
Answer: Options #3: Tin and Hydrogen
Explanation:
Tin has 50 protons
Hydrogen has 1 proton
50 + 1 = 51 protons
♡ The Question/Task(s)! ♡
✦ || Which two elements, in looking at their atoms, have a total of 51 protons between them?
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♡ The Answer(s)! ♡
✦ || The answer is, "Tin and Hydrogen"!
I apologize in advance if the answer is incorrect! ♡
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♡ The Explanation(s)/Step-By-Step! ♡
✦ || If you combine each of the number of protons, Magnesium and Aluminum would contain 25 total! Magnesium consists of 12 protons, while Aluminum has 13. If you combine the number of protons for Lithium and Scandium, the result would be 24 total! Lithium contains 3 protons, while Scandium has 21. If you add the total number of protons between Magnesium, Aluminum, Lithium, and Scandium, the answer would be 49! If you combine the number of protons for Tin and Hydrogen, however, you would receive the total number of 51! Tin consists of 50 protons, while Hydrogen only has 1, therefore, the answer is Tin and Hydrogen!
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♡ Tip(s)! ♡
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Which reaction occurs at the anode in an electrochemical cell?.
Answer:
In voltaic cells, oxidation occurs at an anode (-), reduction at a cathode (+), and electrons flow from anode to cathode. In electrolytic cells, oxidation occurs at an anode, reduction occurs at a cathode, and electrons flow from anode to cathode.
Explanation:
A 3. 81-gram sample of nahco3 was completely decomposed in an experiment
In the decomposition reaction, the reactants split into products. The mass of carbonic acid that will be produced from the decomposition of sodium bicarbonate is 1.67 gm.
What is mass?Mass is the product of the moles and the molar mass of the substance. It is the weight present of the substance in reaction and is calculated in grams.
The decomposition reaction can be shown as,
[tex]\rm 2NaHCO_{3} \rightarrow Na_{2}CO_{3} + H_{2}CO_{3}[/tex]
From the reaction, it can be seen that 2 moles of sodium bicarbonate decompose to produce 1 mole each of carbonic acid and sodium carbonate.
Moles of sodium carbonate is calculated to estimate the mass of carbonic acid:
[tex]\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{2.86}{105.99}\\\\&= 0.02698\;\rm moles\end{aligned}[/tex]
Mass of carbonic acid is calculated as:
[tex]\begin{aligned} \rm mass &= \rm moles \times molar\; mass\\\\&= 0.02698 \times 62.03 \\\\&= 1.67 \;\rm gm\end{aligned}[/tex]
Therefore, 1.67 gm of carbonic acid will be produced.
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Heeeeellllllppppppp!!!!!
soda water is a mixture of carbon dioxide gas and water. typically, more bubbles of carbon dioxide gas form near the surface and sides of a glass of soda water than in the middle. soda water is:
a. homogeneous.
b. heterogeneous.
Answer:
Heterogeneous
Explanation:
What do you think will Happen To the ecosystem if all the coral reefs are destroyed?
Answer:
Extinction.
Explanation:
Animals living off coral would die with no food to eat ruining millions of food chains
Answer:
The Coral reefs provide protection against flooding and the erosion of coastlines. With them gone, there will be rapid erosion of coastlines and many small island countries might even vanish from the world map
Explanation:
Hope this helps Have a great day!!!!!
An element in Group 2 of the periodic table likely has which characteristics?
shiny solid, conducts heat and electricity, easily bends
shiny solid, does not conduct heat but does conduct electricity, crumbles easily
dull solid, does not conduct heat or electricity, does not bond with other atoms
gas, does not conduct heat or electricity, easily bonds with other atoms
Answer:
Option #1: shiny solid, conducts heat and electricity, easily bends
Explanation:
alkaline-earth metal, any of the six chemical elements that comprise Group 2 (IIa) of the periodic table. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
These physical properties of group 2 elements are: low density (mass over volume) low melting points (except beryllium) low boiling points (except beryllium)
♡ The Question/Task(s)! ♡
✦ || An element in Group 2 of the periodic table likely has which characteristics?
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♡ The Answer(s)! ♡
✦ || The answer is, "Shiny solid, conducts heat and electricity, easily bends"!
I apologize in advance if the answer is incorrect! ♡
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♡ The Explanation(s)/Step-By-Step! ♡
✦ || The elements in Group 2 of the periodic table consist of malleable metals! The elements have a soft metallic texture that can be shaped, and can conduct a source of both electricity and heat!
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♡ Tip(s)! ♡
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Which of these equations is balanced? (Select all that are correct)
2Fe + 3Cl₂ → 2FeCl₃
H₂ + O₂ → 2H₂O
2Na + Cl₂ → 2NaCl
2CaCO₃ → 2CaO + CO₂
2CaCO3 =2CaO+CO2 is balanced but we can change 2CaCO =2CaO3+C03