# Calculate a sample for the preparation of 200 g of 0.9% NaCl solution.

August 19, 2021 | education

| Let’s calculate the masses of the components of the solution.

This requires multiplying their mass fraction by the weight of the solution.

Let’s calculate the weight of the dissolved salt.

M salt = 200 x 0.009 = 1.8 grams;

Similarly, we find the weight of the solvent (water).

(In the calculations, we take the density of water equal to 1 gram / ml).

M water = 200 x (1 – 0.009) = 198.2 grams;

Let’s check. To do this, add the masses of the components of the solution and get the mass of the solution in question.

198.2 + 1.8 = 200;

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