# Determine the mass of sodium hydroxide (NaOH) required to obtain 100g. table salt (NaCl)

September 30, 2021 | education

| **Determine the mass of sodium hydroxide (NaOH) required to obtain 100g. table salt (NaCl), if sodium hydroxide has an impurity of 10%**

From 1 mol of sodium alkali, 1 mol of sodium chloride can be synthesized.

Let’s calculate the chemical amount of a substance in 100 grams of table salt.

M NaCl = 23 + 35.5 = 58.5 grams / mol;

N NaCl = 100 / 58.5 = 1.71 mol;

The same amount of alkali is needed.

Let’s calculate its weight.

M NaOH = 23 + 16 + 1 = 40 grams / mol;

m NaOH = 1.17 x 40 = 46.8 grams;

Taking into account that sodium hydroxide contains 10% impurities, the weighed amount of alkali will be 46.8 / 0.9 = 52 grams;

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