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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 [S^2-] exceeds the concentration of

Now, The first dissociation of H₂S is

K_a1 is

ie. ...(1)

Second Dissociation of H₂S is

K_a₂ 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 1 year ago

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