# Problem: Calculate the pH when 1.11 g of CH3COONa (FW = 82.03 g/mol) is added to 41 mL of 0.500 M acetic acid, CH3COOH. Ignore any changes in volume. The Ka value for CH3COOH is 1.8 x 10-5. Enter your answer with decimal places.a. 4.33b. 4.98c. 6.22d. 2.91e. 4.56

###### FREE Expert Solution

We’re being asked to calculate the change in pH when 1.11 g of CH3COONa is added to 41 mL of 0.50 M acetic acid (CH3COOH) solution.

For this problem, follow these steps:

Step 1. Identify the conjugate base and weak acid

Step 2. Calculate the moles of weak acid

Step 3. Calculate the moles of conjugate base

Step 4. Calculate the pKa and pH

Step 1. The solution is composed of 0.50 M CH3COOH and 1.11 g CH3COONa .

CH3COOH

possess an Hion connected to a nonmetal (N) and oxygen oxyacid
▪ have an equal number of oxygens than hydrogens → weak acid

###### Problem Details

Calculate the pH when 1.11 g of CH3COONa (FW = 82.03 g/mol) is added to 41 mL of 0.500 M acetic acid, CH3COOH. Ignore any changes in volume. The Ka value for CH3COOH is 1.8 x 10-5. Enter your answer with decimal places.

a. 4.33

b. 4.98

c. 6.22

d. 2.91

e. 4.56

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Buffer concept. You can view video lessons to learn Buffer. Or if you need more Buffer practice, you can also practice Buffer practice problems.

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