Chemistry Practice Problems Solution Stoichiometry Practice Problems Solution: Potassium hydrogen phthalate (KHP) is often used a...

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Solution: Potassium hydrogen phthalate (KHP) is often used as a primary standard in acid-base titrations. If 19.15 mL of NaOH is required to neutralize 0.442 g of KHP, what is the concentration of NaOH?

Problem

Potassium hydrogen phthalate (KHP) is often used as a primary standard in acid-base titrations. If 19.15 mL of NaOH is required to neutralize 0.442 g of KHP, what is the concentration of NaOH?

Solution

During titration, the acid and base reacts. In the given, NaOH is the base while KHP is the acid. Since KHP is an acid, it will donate a proton (H+) (based on the Bronsted-Lowry definition).

KHP and NaOH will break up into their ions in the solution and will react as shown:


Balanced Reaction:  KHP + NaOH  NaKP + H2O

Given:

V NaOH = 19.15 mL

Mass KHP = 0.442 g

[NaOH] = ?


Calculate for the concentration of NaOH using the following steps:

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