Buffer solutions

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

• 4

• 5

• 6

• 8

• 9

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

a buffer solution is made of mixture of aqueous methanoic acid, HCOOH, with aqueous sodium methanoate, NaHCOO.

the equilibrium reaction takes place in buffer solution is :

HCOOH ↔ HCOO^- + H⁺

small amount of NaOH is then added to that buffer solution.

What reaction take places at the buffer solution to resist change of pH caused by addition of base?

• HCOOH + H⁺ → HCOOH₂

• HCOO^- + H⁺ → HCOOH

• HCOOH + OH^- → HCOO^- + H₂O

• HCOO^- + OH^- → COO^2- + H₂O

a buffer solution is made of mixture of aqueous ethanoic acid, CH₃COOH, with aqueous potassium ethanoate, KCH₃COO.

the equilibrium reaction takes place in buffer solution is :

CH₃COOH ↔ CH₃COO^- + H⁺

small amount of HCl is then added to that buffer solution.

What reaction take places at the buffer solution to resist change of pH caused by addition of acid?

• CH₃COO^- + H⁺ → CH₃COOH

• CH₃COO^- + OH^- → CH₂COO^2- + H₂O

• CH₃COOH + H⁺ → CH₃COOH₂

• CH₃COOH + OH^- → CH₃COO^- + H₂O

a buffer solution is made by mixing HA, a weak acid, with salts containing A^- ions.

HA ↔ H⁺ + A^-

a formula that can be used for the calculation of the pH of this buffer solution is

• 
• 
• 
• 

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

What might happen if buffers did not exist within the human body?

• Our blood and other bodily fluids might become too acidic or basic.
• Our stomach acid would not be able to break down food.
• We would not be able to process glucose within our cells.
• We would not be able to inhale oxygen into our lungs.

pH stands for:

• Potency of hydrogen
• Plurality of hydrogen
• Potential of hydrogen
• Pleurisy of hydrogen

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