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26. A solution of 0.075 M CoBr2 is saturated with H2S ( [H2S] = 0.10 M)....

26.

A solution of 0.075 M CoBr2 is saturated with H2S ( [H2S] = 0.10 M). What is the minimum pH at which CoS ( Ksp = 5.9 x 10 -21) will precipitate?
Ka1 =8.9 x 10 -8 & Ka2 = 1.2 x 10 -13 for H2S and Ksp for CoS = 5.9 x 10 -21

Solutions

Expert Solution

Answer:

Given:-

In satutated solution of CoS the solubility equilibrium exist as

...(A)

The solubility product for eq(A) is

ie.

Hence,

Ie. The precipitate of CoS will form only if [S2-] exceeds the concentration of

Now, The first dissociation of H2S is

Ka1 is

ie. ...(1)

Second Dissociation of H2S is

Ka2 is

ie. ...(2)

from eq(1) and (2) we have,

ie. ...(3)

Now putting the values in eq(3) we get,

ie.

  

Taking square root of both side we get,

Now,

queen_honey_blossom answered 2 years ago
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