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A 4.0021g sample of impure KHP (KHP+NCL was dissolved in enough water to make 100.00ml of...

A 4.0021g sample of impure KHP (KHP+NCL was dissolved in enough water to make 100.00ml of solution. A 25.00 ml sample of the KHP solution required 19.20 m of 0.105 NaOH to reach the end point. what is the m/m % of KHP in the original mixture.

KHC8H4O4 + NaOH--> NaC8H4O4 + H2O

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