For the standardization of their sodium hydroxide solution a pair of students weighed out 0.5342 g of khp (mm 204.22 g/mol). they found that it took 21.36 ml of their naoh solution to reach the endpoint. what is the concentration of their naoh solution?

The concentration of their NaOH solution is 0.1225 M.

Explanation:

Moles of KHP :

Given, Mass of KHP = 0.5342 g  

Molar mass of KHP = 204.22 g/mol

The formula for the calculation of moles is shown below:

Thus,

According to the reaction shown below:

KHP + NaOH ⇒ KNaP + H₂O

1 mole of KHP reacts with 1 mole of NaOH

So,

of KHP reacts with of NaOH

Moles of NaOH =

Volume = 21.36 mL = 0.02136 L ( 1 mL = 0.001 L)

The expression for molarity is:-

The concentration of their NaOH solution is 0.1225 M.

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