A) 6.1
B) 7.30
C) 8.42
D) 7.90
Correct Answer: C
Solution :
\[Cu\,\,{{(OH)}_{2}}(s)\,\,\rightleftharpoons \,\,C{{\underset{S}{\mathop{u}}\,}^{2+}}(aq.)+\underset{2S}{\mathop{2O}}\,\,{{H}^{-}}(aq.)\] |
\[{{K}_{sp}}=4\,\,{{S}^{3}}\] |
\[\therefore \,\,S=4\times {{10}^{-7}}\] |
\[[O{{H}^{-}}]=2\,\,S=8\times {{10}^{-7}}\] |
\[pOH=6.1\] \[\therefore pH=7.90\] |
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