Question

3.
Pragya tested the solubility of three different substances at
different temperatures and collected the data as given below
fresults are given in the following table, as grams of substance
dissolved in 100 grams of water to form a saturated solution)
Substance Dissolved
Temperature in K
353
Solubility
Potassium nitrate
21
32
106
167
Sodium chloride
36
36
36
37
37
Potassium chloride
35
35
40
46
54
Ammonium chloride
37
41
55
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?

please answer​

Answer 1

At 313K 62g of potassium nitrate dissolved in 100g of water. So to produce a saturated solution of potassium nitrate in 50g of water we need  of potassium nitrate.

Some soluble potassium chloride will separate out in the form of crystal at room temperature because the solubility of potassium chloride will decrease.

 

(i)  Solubility of Potassium nitrate at 293K is 32g.

(ii)  Solubility of sodium chloride at 293K is 36g.

(iii) Solubility of Potassium chloride at 293K is 35g.

(iv) Solubility of Ammonium chloride at 293K is 37g.                                                      

The solubility of Ammonium chloride is highest at this temperature.

The solubility of salt increases with the increase in temperature.