Calculate the molarity, M, of the NaOH

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To calculate the molarity of NaOH used in the titration with potassium acid phthalate (KHP), the correct molecular weight of KHP is crucial. The molecular weight of KHP is confirmed to be 204.22 g/mol, not 71.08 g/mol as initially stated. The calculation involves taking the mass of KHP (0.426 g), dividing it by its molecular weight (204.22 g/mol), and then dividing by the volume of NaOH used in liters (16.98 mL converted to 0.01698 L). The correct formula yields a molarity of NaOH that reflects the accurate molecular weight of KHP.
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An amount of potassium acid phthalate (KHP) weighs 0.426 g. The KHP is dissolved in a small amount of water and titrated with 16.98 mL of NaOH. Calculate the molarity, M, of the NaOH.

The following is my answer, but it was wrong. Can anyone help? Thanks

Molecular weight of KHP = 71.08
0.426/71.08/0.01698 = 0.353
 
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The molecular weight of KHP is 204.22 g/mol. Assuming 16.98 mL was the amount needed to reach the end point your calculation is correct except for the molar mass of KHP.
 
Thanks alot

:smile: :smile: :smile:
 
no problem
 

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