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Home / Doubts and Solutions/JEE/Chemistry

Exercisee 3

Asked by rbhatt16 25th November 2017, 9:07 PM
Answered by Expert
Answer:
G i v e n colon K a space equals space 2 cross times 10 to the power of negative 12 end exponent left square bracket H S a c right square bracket space equals space 4 cross times 10 to the power of negative 4 end exponent m o l e s space i n space 200 c c space equals space space 4 cross times 10 to the power of negative 4 end exponent m o l e s space i n space 200 m l l e t s space c o n v e r t space i t space t o space m o l e s space p e r space l i t space b y space m subscript 1 v subscript 1 space equals space m subscript 2 v subscript 2 4 cross times 10 to the power of negative 4 end exponent space cross times space 200 space equals space m subscript 2 space end subscript cross times space 1000 m subscript 2 space end subscript equals space 8 cross times space 10 to the power of negative 5 end exponent m o l divided by l i t p H space equals space 3 space f r o m space g i v e n space p H space l e t s space f i n d space left square bracket H subscript 3 O to the power of plus right square bracket p H space equals space minus log space left square bracket H subscript 3 O to the power of plus right square bracket 3 space space space space equals space minus log space left square bracket H subscript 3 O to the power of plus right square bracket log space left square bracket H subscript 3 O to the power of plus right square bracket space equals space minus 3 space space space space space space..... space b y space t a k i n g space a n t i log space w e space g e t space left square bracket H subscript 3 O to the power of plus right square bracket space equals space 1 cross times 10 to the power of negative 3 end exponent A s comma space K a space equals space fraction numerator space left square bracket H subscript 3 O to the power of plus right square bracket space left square bracket S a c to the power of minus right square bracket over denominator left square bracket H S a c right square bracket end fraction space space space space 2 cross times 10 to the power of negative 12 end exponent equals space fraction numerator 1 cross times 10 to the power of negative 3 end exponent cross times left square bracket S a c to the power of minus right square bracket over denominator 8 cross times 10 to the power of negative 5 end exponent end fraction left square bracket S a c to the power of minus right square bracket space equals space fraction numerator 2 cross times 10 to the power of negative 12 end exponent cross times 8 cross times 10 to the power of negative 5 end exponent over denominator 1 cross times 10 to the power of negative 3 end exponent end fraction left square bracket S a c to the power of minus right square bracket space equals space 16 space cross times space 10 to the power of negative 14 end exponent space m o l divided by l i t
Answered by Expert 27th November 2017, 3:52 PM
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