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Calculate the pH of the solution in which 0.2M NH4Cl and 0.1M NH3 are present. The pKb of ammonia solution is 4.75.

Calculate the pH of the solution in which 0.2M NH4Cl and 0.1M NH3 are present. The pKb of ammonia solution is 4.75.

Grade:11

1 Answers

Arun
25763 Points
2 years ago
Dear Abhishek
 
To solve pH of buffer solutions you use the Henderson - Hasselbalch equation for basic buffers:  
Because you have a basic buffer first solve for pOH  
pOH = pKb + log ([salt]/[base])  
You have pKb = 4.75  
You have [salt] = 0.2M 
You have [base] = 0.1M  
Substitute into equation:  
pOH = 4.75 + log (0.2/0.1)  
pOH = 4.75 + log 2  
pOH = 4.75 + 0.30  
pOH = 5.05  

pH = 14.00-pOH  
pH = 14.00-5.05  
pH = 8.95
 
Regards
Arun (askIITians Forum expert)

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