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Q.

What is the minimum pH when Fe(OH)3 starts precipitating from a solution containing 0.1 M FeCl3?

(Ksp of  Fe(OH)3=8×1013M3)

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a

8.3

b

10.3

c

5.7

d

3.7

answer is C.

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Detailed Solution

Here, we have Fe(OH)3 as,

Fe3+OH3=8×10130.1        OH=2×104M    pH=10.3

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What is the minimum pH when Fe(OH)3 starts precipitating from a solution containing 0.1 M FeCl3?(Ksp of  Fe(OH)3=8×10−13M3)