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Applications of Colloids

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Question

The concentration of sulphide ion in 0.1M HCl solution saturated with hydrogen sulphide is 1.0 × 10^–19 M. If 10 mL of this is added to 5 mL of 0.04 M solution of the following: FeSO₄, MnCl₂, ZnCl₂ and CdCl₂. in which of these solutions precipitation will take place?

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Solution

For precipitation to take place, it is required that the calculated ionic product exceeds the K_sp value.

Before mixing:

After mixing:

This ionic product exceeds the K_spof Zns and CdS. Therefore, precipitation will occur in CdCl₂ and ZnCl₂ solutions.

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Similar questions

Q. The concentration of sulphide ion in 0.1M

H C l

solution saturated with hydrogen sulphide is

1.0 \times 10^{- 19} M

. If 10 mL of this is added to 5 mL of 0.04 M solution of

{F e S O}_{4}, {M n C l}_{2}, {Z n C l}_{2}

{C d C l}_{2}

. In which of these solutions precipitation will take place?

Q. A solution which is

10^{- 3} M

{M n}^{2 +}, {F e}^{2 +}, {Z n}^{2 +}

{H g}^{2 +}

is treated with

10^{- 16} M

sulphide ion. If

K_{s p}

M n S, F e S, Z n S

H g S

10^{- 13}, 10^{- 18}, 10^{- 24}

10^{- 53}

respectively, which one will precipitate first?

Q. A solution which is

10^{- 3} M

M n^{2 +}, F e^{2 +}, Z n^{2 +}

H g^{2 +}

is treated with

10^{- 16} M

sulphide ion. If

K_{s p}

of MnS,FeS,ZnS andHgS are

10^{- 15}, 10^{- 23}, 10^{- 20}

10^{- 54}

respectively, which one will precipitate first?

Q. A saturated solution of

H_{2} S

0.1

M

H C l

25^{o} C

S^{2 -}

ion concentration of

10^{- 23}

m o l

L^{- 1}

. The solubility product of some sulphides are

C u S = 10^{- 44}

F e S = 10^{- 14}

M n S = 10^{- 15}

C d S = 10^{- 25}

0.01 M

solution of these salts in

1 M

H C l

are saturated with

H_{2} S

, which of these will be precipitated?

Q. A solution which is

10^{- 3} M

M n^{2 +}, F e^{2 +}, Z n^{2 +}

H g^{2 +}

is treated with

10^{- 16} M

sulphide ion. If the

K_{s p}

M n S, F e S, Z n S

H g S

10^{- 15}, 10^{- 23}, 10^{- 20}

10^{- 54}

respectively, which one will precipitate first?

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