# How do you calculate the grams solute required to make the following solution: 2.5 L of 0.90% of NaCl (m/v)?

##### 1 Answer

May 13, 2017

Here's how you can do that.

#### Explanation:

You know that a solution's **mass by volume percent concentration**,

This implies that a **for every**

You can thus say that

#2.5 color(red)(cancel(color(black)("L"))) * (10^3color(white)(.)"mL")/(1color(red)(cancel(color(black)("L")))) = 2.5 * 10^3# #"mL"#

of

#2.5 * 10^3 color(red)(cancel(color(black)("mL solution"))) * "0.90 g NaCl"/(100color(red)(cancel(color(black)("mL solution"))))= color(darkgreen)(ul(color(black)("23 g NaCl")))#

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