I guess normal salt hydrolysis should work out well
Although its possible I've forgotten the formula
Do tell the exact issue, it'll be more helpful. @Gaurav_Singh11
PS is the answer 5.15?
Edit it should be pk_b not pk_a .
@Devanshu_Shah , it may be a basic doubt but how to find log C in this question.
This one is indeed tricky even I made a mistake the first time (took moles instead of equivalents, read along to know why its wrong)
In the question H+ is 5meq so we need 5meq NH3 so 40ml NH3
This will lead to form 5meq of salt
So conc of salt will be 5meq/50ml
Note: I used equivalent in finding the conc of salt since effectively we need the [NH4+] not the salt
Is it 10.75?