Question
Asked Mar 16, 2020
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15.0 mL sample of a 0.437 M aqueous nitrous acid solution is titrated with a 0.441 M aqueous potassium hydroxide solution. What is the pH at the start of the titration, before any potassium hydroxide has been added?

pH = __________

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Expert Answer

Step 1

Acid dissociation constant (Ka) for aqueous nitrous acid solution can be written as below,

The value of Ka of nitrous acid is 4.5 ×10-4

Chemistry homework question answer, step 1, image 1

Step 2

An ICE table is constructed to determine the equilibrium concentration of H3O+ as follows,

Chemistry homework question answer, step 2, image 1

...

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