you need

- - the mass of the solute;
- - the mass of the solution.

Guide

1

Mass fraction, it is the concentration of interest - a dimensionless quantity, which is the ratio of the mass of the solute to the total weight of the liquid.Most often it is expressed as a percentage, what you need to multiply the resulting ratio of one hundred.In a formula percentage

**concentration can be written in the following way: ω = m in the islands / m r-ra * 100%.The first value is the mass of the substance, and the second - the mass of the entire solution.** 2

often in the tasks given percentage concentration of a substance, based on which, you want to find a lot of substance or weight of the solution.Make it very simple, just need to convert the or
iginal formula.To determine the mass of matter it will be the following: m in the islands = m r-ra * ω / 100.The weight of the solution can be found as follows: divide the mass of matter in the interest

**concentration**and multiply the result by one hundred.Unit weight of substance and weight of the solution - program. 3

To determine the concentration of interest if a solution was obtained using crystalline, you should use a different algorithm solutions.Crystalline structure is Me: (x) K-ta (y) * nH2O.The condition of the problem, which appears hydrated, should provide information on the mass of the crystalline and dry mass of metal-X-acid-y.In this case, the percentage concentration of the bulk solution will be multiplied by the molar mass of crystalline divided by the weight of crystalline, multiplication coefficient dry matter and with a molar mass of dry matter.

Helpful Hint

counting the weight of the solution, note that it is composed of two values: the mass of the solvent and the mass of the substance dissolved in it.The omission of this fact is the large number of errors at the time of solving such problems.