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Using a 0.25 M phosphate buffer with a pH of 6.7, you add 0.72 mL of...

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Chemistry

Using a 0.25 M phosphate buffer with a pH of 6.7, you add 0.72mL of 0.45 M HCl to 49 mL of the buffer. What is the new pH of thesolution? (Enter your answer to three significant figures.)

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