Question 1

Which statement is FALSE?

Accepted Answer

The answer of Which statement is FALSE?
...

Question 2

Which combination would make a buffer solution?

Accepted Answer

A buffer solution is made from a weak acid and its conjugate base or a weak base and its conjugate acid. H₂CO₃ (carbonic acid) and NaHCO₃ (sodium bicarbonate) form a buffer system.

Question 3

A 50.0-mL sample of HNO₃ is neutralized by reaction with 120.0 mL of 2.50 M NaOH.What is the concentration of HNO₃ in the unknown sample?

Accepted Answer

The answer of A 50.0-mL sample of HNO₃ is neutralized...

Question 4

A buffer solution contains a mixture of carbonic acid (H₂CO₃)and potassium hydrogen carbonate (KHCO₃).What reaction will take place if H⁺ is added to this solution?

Accepted Answer

When H⁺ is added to the buffer solution, it reacts with the bicarbonate ion (HCO₃⁻) to form carbonic acid (H₂CO₃), which is the correct reaction for a buffer system containing carbonic acid and bicarbonate.

Question 5

A 25.0-mL sample of HBr is neutralized by reaction with 20.0 mL of 3.00 M KOH.What is the concentration of HBr in the unknown sample?

Accepted Answer

The concentration of HBr can be found using the concept of molarity and the stoichiometry of the neutralization reaction. In a neutralization reaction, HBr reacts with KOH in a 1:1 molar ratio. The moles of KOH can be calculated as (volume in L) * (molarity) = 0.020 L * 3.00 M = 0.060 moles. Since the reaction is 1:1, the moles of HBr are also 0.060. The concentration of HBr is then (moles of HBr) / (volume of HBr in L) = 0.060 moles / 0.025 L = 2.4 M.

Question 6

A buffer solution contains a mixture of acetic acid (HC₂H₃O₂)and potassium acetate (KC₂H₃O₂).What reaction will take place if H⁺ is added to this solution?

Accepted Answer

When H₂SO₄ is added to a buffer solution of acetic acid and potassium acetate, it reacts with the acetate ion (CH₃COO⁻) to form acetic acid (CH₃COOH). This is because H₂SO₄ is a strong acid and will donate a proton to the acetate ion, converting it back to acetic acid and thus maintaining the buffer's pH.

Question 7

Which solution will turn litmus paper blue?

Accepted Answer

Litmus paper turns blue in a basic (alkaline) solution. NaOH is a strong base, and a concentration of 0.5 M is enough to cause the litmus paper to turn blue. HCl, HBr, and a long, complex or unknown solution are all acids and would turn the litmus paper red.

Question 8

Which combination would make the MOST effective buffer solution?

Accepted Answer

The answer of Which combination would make the MOST effective...

Question 9

A 50.0-mL sample of H₂SO₄ is neutralized with NaOH solution having a concentration of 2.00 M.If 35.5 mL of NaOH are required to complete the neutralization,what is the concentration of the sulfuric acid solution?

Accepted Answer

The correct answer is A because the concentration of the sulfuric acid solution is 0.710 M.

Question 10

Which solution will turn litmus paper red?

Accepted Answer

Litmus paper turns red in the presence of acids. Option C is a strong acid with a concentration of 4.5 M and is likely to turn the litmus paper red. The other options are either basic or have a low concentration of ions and are unlikely to turn the litmus paper red.

Quiz 12: Acids Bases

Which statement is FALSE?

Which combination would make a buffer solution?

A 50.0-mL sample of HNO₃ is neutralized by reaction with 120.0 mL of 2.50 M NaOH.What is the concentration of HNO₃ in the unknown sample?

A buffer solution contains a mixture of carbonic acid (H₂CO₃) and potassium hydrogen carbonate (KHCO₃) .What reaction will take place if H⁺ is added to this solution?

A 25.0-mL sample of HBr is neutralized by reaction with 20.0 mL of 3.00 M KOH.What is the concentration of HBr in the unknown sample?

A buffer solution contains a mixture of acetic acid (HC₂H₃O₂) and potassium acetate (KC₂H₃O₂) .What reaction will take place if H⁺ is added to this solution?

Which solution will turn litmus paper blue?

Which combination would make the MOST effective buffer solution?

A 50.0-mL sample of H₂SO₄ is neutralized with NaOH solution having a concentration of 2.00 M.If 35.5 mL of NaOH are required to complete the neutralization,what is the concentration of the sulfuric acid solution?

Which solution will turn litmus paper red?

Quiz 12: Acids Bases

Which statement is FALSE?

Which combination would make a buffer solution?

A 50.0-mL sample of HNO3 is neutralized by reaction with 120.0 mL of 2.50 M NaOH.What is the concentration of HNO3 in the unknown sample?

A buffer solution contains a mixture of carbonic acid (H2CO3) and potassium hydrogen carbonate (KHCO3) .What reaction will take place if H+ is added to this solution?

A 25.0-mL sample of HBr is neutralized by reaction with 20.0 mL of 3.00 M KOH.What is the concentration of HBr in the unknown sample?

A buffer solution contains a mixture of acetic acid (HC2H3O2) and potassium acetate (KC2H3O2) .What reaction will take place if H+ is added to this solution?

Which solution will turn litmus paper blue?

Which combination would make the MOST effective buffer solution?

A 50.0-mL sample of H2SO4 is neutralized with NaOH solution having a concentration of 2.00 M.If 35.5 mL of NaOH are required to complete the neutralization,what is the concentration of the sulfuric acid solution?

Which solution will turn litmus paper red?

A 50.0-mL sample of HNO₃ is neutralized by reaction with 120.0 mL of 2.50 M NaOH.What is the concentration of HNO₃ in the unknown sample?

A buffer solution contains a mixture of carbonic acid (H₂CO₃) and potassium hydrogen carbonate (KHCO₃) .What reaction will take place if H⁺ is added to this solution?

A buffer solution contains a mixture of acetic acid (HC₂H₃O₂) and potassium acetate (KC₂H₃O₂) .What reaction will take place if H⁺ is added to this solution?

A 50.0-mL sample of H₂SO₄ is neutralized with NaOH solution having a concentration of 2.00 M.If 35.5 mL of NaOH are required to complete the neutralization,what is the concentration of the sulfuric acid solution?