CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

40 ml of 0.1 M ammonia solution is mixed with 20 mL of 0.1 M HCl. What is the pH of a mixture? (pKb of ammonia solution is 4.74)
  1. 9.26
     
  2. 2.26
     
  3. 4.74
     
  4. 5


Solution

The correct option is A 9.26
 
At half stage of titration, [salt]=[base]
Use the Henderson - Hasselbalch Equation: 
pOH=pKb+log[[salt][base]]
pOH=pKb+log[[NH4Cl][NH3]]
pOH=pKb=4.74   ([salt]=[base])
pH=14pOH
pH=144.74=9.26

flag
 Suggest corrections
thumbs-up
 
0 Upvotes


Similar questions
View More...


People also searched for
QuestionImage
QuestionImage
View More...



footer-image