CBSE Class 6 Answered

(a) A solution in which no more substance can be dissolved at that temperature is called a saturated solution.

(b) The solubility of sodium chloride in water is 36 grams at 20^oC means that a maximum of 36 grams of sodium chloride can be dissolved in 100 grams of water at a temperature of 20^oC.

If 45 grams of sodium chloride is added to 100 grams of water at 20^oC, then the excess salt will remain undissolved in water.

(c) If the saturated solution of a substance at a particular temperature is heated to a higher temperature, then the solubility of the substance increases and more of substance can be dissolved in it.

If the saturated solution of a substance at a particular temperature is cooled to a lower temperature, then the solubility of the substance decreases and some of the dissolved substance will separate out in the form of solid crystals.