What is the effect of temperature on the solubility of a salt?

CBSE Class 9 CBSE Class 9 Science
1

Rama tested the solubility of four substances at different temperatures and recorded the following observations regarding few gram of each substance dissolved in 100 g of water to form a saturated solution.
image

  1. Which soution is least soluble at 293 K?
  2. Which substance shows maximum change in its solubility when the temperature is raised from 293 K to 313 K?
  3. Find the amount of ammonium chloride that will separate out when 55 g of its solution at 333 K is cooled to 293 K.
  4. What is the effect of temperature on the solubility of a salt?
  5. What mass of sodium chloride would be needed to make a saturated solution in 10 g of water at 293 K?
2
  1. Potassium nitrate
  2. Potassium nitrate
  3. At 333 K, ammonium chloride dissolved per 100 g = 55 g
    At 293 K, ammonium chloride dissolved per 100 g = 37 g
    When solution is cooled from 333 K to 293 K,
    amount of ammonium chloride that will separate out = 55 g - 37g = 18 g
  4. Solubility of a salt (solid) increases with rise in temperature and vice-versa.
  5. At 293 K, amount of NaCI dissloved in 100 g water = 36 g
    ∴ At 293 K, amount of NaCI dissolved in 10 g water = image = 3.6 g