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

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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