# You have 40g of sodium chloride. What is the minimum amount of water required to dissolve the salt at 30oC?

##### 1 Answer

Jun 18, 2018

#### Answer:

The minimum mass of water is 111 g.

#### Explanation:

**Step 1. Determine the solubility of #"NaCl"# at 30 °C**

I am guessing that "they" are asking you to get the information from a solubility curve for sodium chloride like the one below.

(Adapted from http://www.sciencegeek.net/Chemistry/taters/solubility)

From 30 °C on the horizontal axis, draw a vertical line up until it hits the solubility curve (blue) for

Then draw a horizontal line to the left until it meets the vertical axis, and read the solubility.

The solubility is

**Step 2. Calculate the mass of water required**