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You obtain a 0.956 g sample with an unknown amount of KHP (mol. wt. 204.22 g/mol)....

You obtain a 0.956 g sample with an unknown amount of KHP (mol. wt. 204.22 g/mol). You then find that it takes 21.06 mL of 0.128 M NaOH to neutralize your sample. What percentage of KHP is in your unknown?
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