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Pragya tested the solubility of three different substances at different temperatures and collected the data as a given below (results are given in the following table, as grams or substance dissolved in 100 grams of water to form a saturated solution)

(a) What mass of potassium nitrate would be needed to produce a saturate solution of potassium nitrate in 50 grams of water at 313 K?
(b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.
(c) Find the solubility of each salt at 393 K. Which salt has the highest solubility at this temperature?
(d) What is the effect of change of temperature on the solubility of a salt?

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(a) At temperature 313K to prepare 50 gms of potassium nitrate, we require 319 of potassium nitrate in 100 gms of water.

(b) Pragya observed that As solution of potassium nitrate cools, it dissolves slowly.


1. At temperature 293 K, 32 gm of potassium nitrate dissolves.

2. At temperature 293K, solubility of NaCl is 36 gm.

3. At temperature 293K, solubility of KCl is 35 gm.

4. At temperature 293K, solubility of NH4Cl is 37 gm.

(d) As temperature increases, rate of solubility increases.

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