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CBSE Class 12-science Answered

A solution is prepared by mixing 100 ml of 0.1 M NH4OH and 200 ml of 0.2 M NH4CL . pKb of NH4OH is 4.8 . Then the pH of the solution is  
Asked by Deepak | 19 Aug, 2018, 12:58: PM
answered-by-expert Expert Answer
Given:
 
Volume of NH4OH = 100 ml
 
Molarity of NH4OH = 0.1 M
 
Volume of NH4Cl = 200 ml
 
Molarity of NH4Cl = 0.2 M
pKb of NH4OH = 4.8
 
We space have comma

pOH space equals pK subscript straight b space plus space log fraction numerator open square brackets Salt close square brackets over denominator open square brackets Base close square brackets end fraction space

space space space space space space space space equals 4.8 plus log fraction numerator 0.2 over denominator 0.1 end fraction

space space space space space space space space space equals 4.8 plus 0.30

pOH space equals 5.1

pH space equals space 14 minus 5.1

space space space space space space space space equals 8.9
 
The pH of the solution is 8.9
Answered by Varsha | 20 Aug, 2018, 01:13: PM
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