Question

Pragya tested the solubility of three different substances at different temperatures and collected the clata as given below (results are given in the following table, as granne of substance dissolved in 100 grams of water to form a saturated solution). Die Temperature in K 293 313 333 353 Solubility tagalom ntate Sodium chloride 21 32 106 36 36 37 35 A6 chloride 66 ( a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K? (i) 30 (ii) 31 (ii) 35 (iii)32 (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 293 K. (d) What is the effect of change of temperature on the solubility of a salt? (i) Solubility increases with increase in temperature. (ii) Solubility decreases with increase intemperature. (iii)Solubility remains constant (iv)Solubility first increases and then decreases (e) Which salt has highest solubility at 353 K? (i) Potassium nitrate (ii) Potassium chloride iii) Sodium chloride iv) Ammonium Chloride ​

Answer 1

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