Question

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

Answer 1

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.


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.