How much water and sodium chloride do you need to take to prepare 160g of a 5% solution?

The mass of the solution is 160 grams;

To find the mass of salt, it is necessary to multiply its mass fraction by the mass of the solution.

m salt = 160 x 0.05 = 8 grams;

To find the mass of water, subtract the mass of salt from the mass of the solution:

m of water = 160 – 8 = 152 grams;

The density of water is 1 gram / cm3. To prepare this solution, you must measure 152 ml of water.

Check: 152 + 8 = 160;