A student standardized a NaOH solution, following the procedure described in thi

Question

A student standardized a NaOH solution, following the procedure described in this module. The student weighed two sample of KHP and transferred them into two 125-mL Erlenmeyer flasks. She dissolved each sample, using distilled water. After adding Phenolphthalein indicator solution to each KHP solution, she titrated the solution the solution with the NaOH solution being standardized the student's data are given in Table 1. Complete the following calculation and, enter the answers in Table 1. Express the volume of NaOH solution used for each titration in liters.

Explanation / Answer

NaOH + KHP --------> NaKP + H2O
1 mole NaOH is needed to neutralise 1 mole KHP

moles KHP = mass / molar mass = 3.0129 g / 204.22 g/mol
= 0.014753 moles

Since reation ratio is 1:1
moles NaOH = moles KHP
= 0.014753 mol NaOH is reuired
Concentration of NaOH reuired is :
Molarity = moles / Litres
= 0.014753 mol / 0.04258 L
= 0.346482 M
= 0.3465 M

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