Q of Day - buffers

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

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

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

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

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

The buffer solution is able to maintain pH in all of these situations except . . .

• The addition of a little acid

• The addition of a little base

• Dilution

• Addition of water

• The addition of excess acid

The buffer solution is able to maintain pH in all of these situations except . . .

• The addition of a little acid

• The addition of a little base

• Dilution

• Addition of water

• The addition of excess acid

Two of the following mixtures of solutions that can form (induced) a buffer solution are . . .

• 0.01 moles HCH₃COO and 0.005 moles NaOH

• 0.01 mole HCH₃COO and 0 moles NaOH

• 0.005 moles HCl 0.01 moles NH₃

• 0.01 moles HCl NaBr 0.2 M

• 0.01 moles HCl 0.01 moles NaOH

Answer explanation

Need a strong acid reaction with weak base

or weak base reaction with strong acid (the strong substance cannot be in excess. It will exceed the buffer capacity)

Strong acid + strong base = not a buffer

Strong acid + weak acid (or acidic salt) = not a buffer

Strong base + weak base (or basic salt) = not a buffer

The pH solution that consist of CH₃COOH 0.01 M and CH₃COONa 0.01 M with Ka = 1 x 10^-5 is . . .

• 4

• 5

• 6

• 8

• 9

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

• NaOH
• HCI
• NaCI
• More ethanoic acid