Buffer

The buffer solution is able to maintain pH by some events, except . . .

• The addition of a little acid

• The addition of a little base

• Dilution

• Addition of water

• The addition of excess acid

The following solution mixture which is not buffer is . . .

• NaH₂PO₄ and Na₂HPO₄

• NH₃ and (NH₄)₂SO₄

• HCOOH and Ba(HCOO)₂

• H₃PO₄ and NaH₂PO₄

• NaOH and Ba(HCOO)₂

Which of the following statements ARE TRUE about buffer solution?

(you may choose more than one answer)

• pH of buffer solution will never change despite addition of small amount of base or acid

• Buffer can be made by mixing weak acid and salt of its conjugate base or by mixing weak base with salt of its conjugate acid

• Buffer has acid and base components that can work specifically to resist pH change

• the closer the ratio of concentration weak acid/base to the concentration of salt of its conjugate base/acid, the less effective the buffer to resist pH change

Which of the following composition or mixture will, in general, form a solution of acidic buffer ?

(you may choose more than one answer)

• strong acid + weak base (in excess)

• strong base + weak acid (in excess)

• weak acid + salt of its conjugate base

• weak base + salt of its conjugate acid

• strong acid (in excess) + strong base

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 of the following pair is correct?

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