Question 1

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

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Question 2

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

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Question 3

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 4

Which statement is FALSE?

Accepted Answer

The answer of Which statement is FALSE?
...

Question 5

Which combination would make the MOST effective buffer solution?

Accepted Answer

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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 H⁺ is added to the buffer solution containing acetic acid and potassium acetate, it will react with the acetic acid according to the following equation: H⁺ + HC₂H₃O₂ → C₂H₃O₂^- + HC₂H₃O₂ This reaction consumes some of the acetic acid, but since the buffer solution contains both acetic acid and its conjugate base (acetate ion), the solution is able to resist significant changes in pH even with the addition of an acid or base. Therefore, the predominant species in the buffer solution remains as HC₂H₃O₂, making option D the correct choice.

Question 7

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

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Question 8

Which combination would make a buffer solution?

Accepted Answer

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...

Question 9

Which solution will turn litmus paper red?

Accepted Answer

Litmus paper turns red in an acidic solution. The solution with the highest concentration of hydrogen ions (H+) is 4.5 M H2SO4, making it the best choice to turn litmus paper red.

Question 10

Which solution will turn litmus paper blue?

Accepted Answer

NaOH is a strong base and will turn litmus paper blue. HCl and HBr are strong acids, which will turn litmus paper red. The long string of characters in option C is meaningless and does not correspond to any known chemical compound.

Quiz 12: Acids Bases

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 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?

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?

Which statement is FALSE?

Which combination would make the MOST effective buffer 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 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?

Which combination would make a buffer solution?

Which solution will turn litmus paper red?

Which solution will turn litmus paper blue?

Quiz 12: Acids Bases

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 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?

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?

Which statement is FALSE?

Which combination would make the MOST effective buffer 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 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?

Which combination would make a buffer solution?

Which solution will turn litmus paper red?

Which solution will turn litmus paper blue?

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 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?

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 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?