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Calculate the pH of a buffer solution that contains 0.71 M NaH2PO4 and 0.12M Na2HPO4. I got the...

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Chemistry

Calculate the pH of a buffer solution that contains 0.71 MNaH2PO4 and 0.12MNa2HPO4.

I got the answer to the first part which is 6.44, I needhelp with the second part

Calculate the change in pH if 0.070 g of solid NaOH is added to250 mL of the solution in the problem above
.

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Calculate the pH of a buffer solution that contains 071 M NaH2PO4 and 012M Na2HPO4 I got the answer to the first part which is 644 I need help with the second part Calculate the change in pH if 0070 g of solid NaOH is added to 250 mL of the solution in the problem above NaH2PO4 Na H2PO4    See Answer
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