Question

A sample of sea water contains 2.8% NaCl by mass having density 1.03 g/ml. How much water should be evaporated from ${10}^{6}$ litre sea water in order to have saturated solution of NaCl. (Solubility of NaCl being 318.83g/litre in pure water)​

Answer 1

Answer:

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.

Explanation:

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.