Rahul tested the solubility of four salts A, B, C and D at different temperatures and
collected the following data (solubility means amount of solute grams dissolved in 100g of
water to give a saturated solution).
Salt dissolved Solubility at different temperatures
15C 40C 50C 60C 70C
A 23 35 40 92 105
B 44 44 46 48 50
C 25 30 34 40 43
D 24 38 40 54 65
Study the data and answer the following questions:
(i) Which salt has the highest solubility and lowest solubility at 500C?
(ii) The solubility of which salt is least affected by an increase in temperature?
(iii) Which salt shows considerable increase in solubility with increasing temperature?
Answers
Answer:
Explanation:
At 313 K 62 g of potassium nitrate dissolved in 100 g of water. So to produce a saturated solution of potassium nitrate in 50 g of water we need
100
62
×50=31 g of potassium nitrate.
(b)Some soluble potassium chloride will separate out in the form of crystal at room temperature because the solubility of potassium chloride will decrease.
(c)
(i) Solubility of Potassium nitrate at 293 K is 32 g.
(ii) Solubility of sodium chloride at 293 K is 36 g.
(iii) Solubility of Potassium chloride at 293 K is 35 g.
(iv) Solubility of Ammonium chloride at 293 K is 37 g.
The solubility of Ammonium chloride is highest at this temperature.
(d)The solubility of salt increases with the increase in temperature.