8.4 Buffer

Buffer is defined as

• ability to resist pH change
• ability to prevent pH from decreasing
• ability to resist a pH increase
• ability to resist pH change when small amount of acid added

Acidic buffer is made up of

• weak acid and weak base
• weak acid and its conjugate salt
• weak acid and its conjugate base
• strong acid and its conjugate base

Basic buffer is made up of

• weak base and weak acid
• weak base and its conjugate salt
• weak base and its conjugate acid
• strong base and its conjugate acid

Which solution A and B of equal volume and concentration mixed together to form a buffer?

• Nitric acid and potassium hydroxide
• Nitric acid and potassium nitrate
• Propanoic acid and potassium hydroxide
• Propanoic acid and potassium propanoate

Which combination will form a buffer solution?

• 100ml of 0.1M HCI with 50ml of 0.1M NaOH
• 100ml of 0.1M CH₃COOH with 50ml of 0.1M NaOH
• 50ml of 0.1M HCI with 100ml of 0.1M NaOH
• 50ml of 0.1M CH₃COOH with 100ml of 0.1M NaOH

Which of the following could be added to a solution of ethanoic acid to prepare a buffer?

• NaOH
• HCI
• NaCI
• More ethanoic acid

Which mixtures act as buffer solutions?

• I and II
• I and III
• II and III
• I, II and III

Which solutions have a pH less than 7?

• I and II
• I and III
• II and III
• I, II and III

Which mixtures could act as buffers?

• I and II
• I and III
• II and III
• I, II and III

Which of the following pair is correct?

• (FeCI₃ - acidic) (Na₂CO₃ - basic)
• (FeCI₃ - neutral) (Na₂CO₃ - basic)
• (FeCI₃ - acidic) (Na₂CO₃ - neutral)
• (FeCI₃ - neutral) (Na₂CO₃ - neutral)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2