Problem: Part AA 0.172 M weak acid solution has a pH of 2.78. Find Ka for the acid. Express your answer using two significant figures.

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Part A

A 0.172 M weak acid solution has a pH of 2.78. Find Ka for the acid. 

Express your answer using two significant figures.

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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 Weak Acids concept. If you need more Weak Acids practice, you can also practice Weak Acids practice problems.