How many grams of salt can be dissolved in 100 g of H2O at 80 degrees Celsius?

1 Answer
Oct 28, 2015

Answer:

About #"40 g"#

Explanation:

You can determine how many grams of sodium chloride, commonly known as table salt, can be dissolved in #"100 g"# of water at #80^@"C"# by taking a look at its solubility graph.

A substance's solubility graph tells you how its solubility changes, let's say starting from room temperature, when temperature is either decreased or increased.

http://www.sciencegeek.net/Chemistry/taters/solubility.htm

As you can see, at room temperature sodium chloride has a solubility of approximately #"35 g/100 g H"_2"O"#.

As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than #"40 g"# of sodium chloride per #"100 g"# of water at #80^@"C"#.

So, at #80^@"C"#, you will ahve an unsaturated solution if you dissolve less than #"40 g"# of sodium chloride, and a saturated solution if you dissolve about #"40 g"# of sodium chloride.