A) 2
B) 3
C) 4
D) 1
Correct Answer: C
Solution :
Key Idea: Use the following formula to calculate pH of solution. \[pH=-\log \,[{{H}^{+}}]\] For weak acid \[[{{H}^{+}}]=C\alpha \] Given, C = concentration = 0.1 M \[\alpha =\] degree of dissociation \[=0.1%=0.001\] \[\therefore \] \[[{{H}^{+}}]=C\alpha =0.1\times 0.001=1\times {{10}^{-4}}\] \[pH=-\log [{{H}^{+}}]\] \[=-\log (1\times {{10}^{-4}})=4\]
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