12 A student does an investigation to find the solubility
of different substances in water. She writes down
her results.
At 20 °C 36 g of sodium chloride dissolved in 100 g of
water. For potassium chloride it was 34 g. Then I tested
potassium nitrate, and 47 g dissolved in 100 g of water.
9
a Write the missing column heading, and the
results, in the table below.
[2]
mass of substance that
dissolved in 100 g of
water (g)
Answers
Answer:
(a) 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 10062×50=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.
Answer:
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