Question
Asked Mar 10, 2020
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what volume of 0.30 M sodium hydroxide must be added to 25.0 ml of 0.500 M acetic acid to produce a solution with a pH of 4.60?

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Expert Answer

Step 1

Given,

Molarity of sodium hydroxide, NaOH = 0.30 M = 0.30 mol/L

Molarity of acetic acid, CH3COOH = 0.50 M = 0.50 mol/L

Volume of acetic acid = 25.0 mL = 0.025 L   (1 mL = 0.001 L)

pH of the solution = 4.60

 

Moles of CH3COOH can be calculated as :

Chemistry homework question answer, step 1, image 1

Step 2

Since the pH is 4.60 which is less than 7, so the solution is acidic, that means all of base, NaOH is consumed in the reaction.

Let the moles of NaOH be x.

 

The reaction involved is :

CH3COOH (aq) + NaOH (aq) → CH3COONa (aq) + H2O (l)

 

The ICE table for this reaction can be written as :

Chemistry homework question answer, step 2, image 1

Step 3

pKa of acetic acid = 4.74

Let V be the total volume of the solution.

 

Using the Henderson Hasselbalch equation, we get,

Chemistry homework question answer, step 3, image 1

...

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