Question

An acetate buffer solution is prepared by combining 50 ml of .20 M acetic acid and 50 ml of .20 M sodium acetate. A 5 ml sample of .10 M naoh is added to the buffer solution which of the following is a correct pairing of the acetate species present in greater concentration and of the ph of the solution after the naoh is added?

Answer 1

An acetate buffer solution
Volume of Acetic Acid = 50 ml
Concentration of Acetic Acid = 0.20 M
Volume of Sodium Acetate = 50 ml
Concentration of Sodium Acetate = 0.20 M
Volume of NaOH = 5 mL of 0.10 M 

The correct pairing is B) Acetic acid with pH > 4.7

Answer 2

The correct pairing of the acetate species is : ( B )

• HC₂H₃O₂ > 4.7

Buffer solution

Given that the volume of acetic acid is 50 ml with a concentration of 0.20 M and the volume of sodium acetate is 50 ml with a concentration of 0.20 M. The solution formed when these chemicals are mixed up will have neutral pH value.  But

When a 5 ml sample of 0.1 M concentration of NaOH ( sodium hydroxide ) a very strong chemical base is added the pH of the solution will tend to be become more basic ( i.e. greater the 4.7 ).

Hence we can conclude that the correct pairing of the acetate species is

HC₂H₃O₂ > 4.7

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