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Using a 0.20 M phosphate buffer with a pH of 7.4, you add 0.71 mL of...

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Chemistry

Using a 0.20 M phosphate buffer with a pH of 7.4, you add 0.71mL of 0.54 M HCl to 59 mL of the buffer. What is the new pH of thesolution? (Enter your answer to three significant figures.)

Using a 0.20 M phosphate buffer with a pH of 7.4, you add 0.71mL of 0.54 M NaOH to 59 mL of the buffer. What is the new pH of thesolution (Enter your answer to three significant figures.)

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