Question

500 ml of pure water (density= 1g/ml )
is saturated with H2S gas, producing a solution of density 0.2g/ml.This solution contains 50% of H2S by weigh t, calculate the volume solution (in liters)

Answer 1

Answer:

∵ Solution has 30% NH

3

by mass.

Therefore, 100 g solution has 30 g NH

3

dissolved in it.

or 70 g H

2

O is saturated by NH

3

= 30 g

∴ 105 g H

2

O will be saturated by NH

3

=

70

30×105

=45 g NH

3

∴ Mass of saturated solution = 100+45 = 150 g

Volume of saturated solution =

density

150

=

0.9

150

=166.67 mL

Now, volume of NH

3

(45 g) at 4

o

and 775 mm pressure,

PV=

m

w

RT

⟹

760

775

×V=

17

45

×0.0821×277

⟹ V=59.03=59 L