Problem: A 0.30  M solution of a salt NaA has pH=9.15. What is the value of K a for the parent acid HA?

FREE Expert Solution

Establish the reaction of NaA in water and setup a Kb expression in it. Using the pH provided and the Kb expression, we can directly calculate for the Kb and eventually Ka.

For this problem, follow the steps:

Step 1. Write the dissociation reaction of NaA

Step 2. Setup the Kb expression for NaA

Step 3. Convert pH to [H+] then to [OH-] to determine the concentration of the products

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A 0.30  M solution of a salt NaA has pH=9.15. What is the value of K a for the parent acid HA?

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