Question

Read the following and answer any four questions from 18

(i) to 18 (v)

Rohini tested the solubility of five substances at different

temperature. She noted the amount of each substance

dissolved in 100 g of water to form a saturated solution at a

particular temperature and reported the following data:
Substance

dissolved

Temperature

20 C 35 C 50 C

A 18.6 21.4 23.8

B 20.0 25.0 35.0

C 8.2 7.9 7.6

D 36.3 40.6 45.4

E 32.0 62.0 106.0

(i.) Which substance is least soluble in water at 20 C?

(a) D

(b) C

(c) A

(d) E



(ii.) Which substance is most soluble in water at 20 C?

(a) D

(b) B

(c) A

(d) E



(iii.) What mass of B would be noted to make a saturated

solution in 50 g of water at 20 C?

(a) 20.0 g

(b) 50.0 g

(c) 15.0 g

(d) 10.0 g



(iv.) What is the amount of E that will separate out when 106.0

g of its solution at 50 C is cooled to 20 C.

(a) 72.0 g

(b) 76.0 g

(c) 74.0 g

(d) 78.0 g



(v.) Which of the solutions show the same effect of temperature

on the solubility of a salt?

(a) A, B, D and E

(b) A, B, C and D

(c) A, C, D and E

(d) A, B, C and E
​

Answer 1

Explanation:

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Answer 2

1. a
2. c
3. d
4. b
5. c

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