pH and Buffers

Mixtures that would be considered buffers include which of the following?

• 0.10 M HCl + 0.10 M NaCl

• 0.10 M HF + 0.10 M NaF

• 0.10 M HBr + 0.10 M NaBr

• 0.10 M HI + 0.10 M NaI

Which of the following reactions shows what happens when potassium hydroxide is added to an ammonium ion/ammonia buffer?

• OH^- + NH₃ ⇌ NH₃OH

• K⁺ + NH₃⇌ KNH₃

• K⁺ + NH₄⁺ ⇌ NH₄K

• OH^- + NH₄⁺ ⇌ NH₃ + H₂O

Which of the following reactions shows what happens when nitric acid is added to an ammonia /ammonium ion buffer?

• H⁺ + NH₃ ⇌ NH₄⁺

• H⁺ + NH₄⁺ ⇌ NH₅²⁺

• NO₃^- + NH₃ ⇌ NH₃NO₃

• NO₃^- + NH₄ ⇌ NH₄NO₃

Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?

• strongly acidic

• slightly acidic

• strongly basic

• slightly basic

Tags

NGSS.HS-LS1-3

An aqueous solution with [OH^-] > [H₃O⁺] is

• Basic or Alkaline

• Acidic

• Neutral

• Equilibrium

Calculate the average volume of acid needed for this neutralisation

• 15.2cm³

• 15.0cm³

• 35.5cm³

• 30.1cm³

Which curve is produced by the titration of a 0.1M weak base with 0.1M strong acid?

• A

• B

• C

• D

The picture below shows the relative concentrations of H+ and OH- in a solution. Is the solution an acid or a base?

• acid

• base

What do you call the product that will be formed after an acid loses H⁺?

• Bronsted acid

• Bronsted base

• Conjugate base

• Conjugate acid

Which of the following solutions can act as a buffer?

• 0.10 M HCl + 0.10 M NaCl

• 0.10 M CH3COOH + 0.10 M CH3COONa

• 0.10 M HNO3 + 0.10 M NaNO3

• 0.10 M H2SO4 + 0.10 M Na2SO4