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Using a 0.30 M phosphate buffer with a pH of 6.3, you add 0.71 mL of...

Using a 0.30 M phosphate buffer with a pH of 6.3, you add 0.71 mL of 0.51 M HCl to 50. mL of the buffer. What is the new pH of the solution? (Enter your answer to three significant figures.)

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