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how many mL of 1.00M KOH should be added to 100mL of solution containing 10.0g of...

how many mL of 1.00M KOH should be added to 100mL of solution containing 10.0g of histidine chloride (FM 191.62) to get pH of 9.30

* answer should be 78.9mL according to book

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