A) 3.4
B) 7.5
C) 5.6
D) 3.75
Correct Answer: A
Solution :
\[pH=-\log {{K}_{a}}+\text{log}\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}\] \[\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }=\frac{0.2\times 50}{1000}=0.01\]; \[\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }=\frac{0.5\times 40}{1000}=0.02\] \[pH=-\text{log}\,\,(1.8\times {{10}^{-4}})+\text{log}\frac{0.01}{0.02}\] \[pH=4-\text{log}\,\,(1.8)+\text{log}\,\,\text{0}.5\] \[pH=4-\text{log}\,\,(1.8)-0.301\] \[pH=3.4\]You need to login to perform this action.
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