# A solution is made by dissolving 3.60g of sodium chloride to a final volume of 115mL solution. What is the weight/volume percent of the solute?

##### 1 Answer

#### Answer:

#### Explanation:

A solution's *weight by volume* percent concentration, *mass by volume* percent concentration, **of solution**.

This implies that in order to determine a solution's weight by volume percent concentration, all you have to do is to figure out the number of *grams* of solute you get **for every** **of solution**.

In your case, you know that you have

As you know, solutions are **homogeneous mixtures**, which implies that they have *the same composition* throughout. This allows you to use the known composition as a **conversion factor** to scale the mass of the solute to a volume of

In other words, you will have

#100 color(red)(cancel(color(black)("mL solution"))) * overbrace("3.60 g NaCl"/(115color(red)(cancel(color(black)("mL solution")))))^(color(blue)("known composition")) = "3.13 g NaCl"#

Since this represents the mass of solute present in

#color(darkgreen)(ul(color(black)("% w/v = 3.13% NaCl")))#

The answer is rounded to three **sig figs**.