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Determine the pH of an HF solution of each of the following concentrations

Chemistry

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Determine the pH of an HF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small? (Ka for HF is 6.8×10−4.)

Part A

0.280 M

Express your answer to two decimal places.

Part B

4.70×10⁻² M

Express your answer to two decimal places.

Part C

2.70×10⁻² M

Express your answer to two decimal places.

Part D

In which cases can you not make the simplifying assumption that x is small?

In which cases can you not make the simplifying assumption that x is small?