I was wondering if i could get some help with these questions.
Number 2 would be a good start.
http://img100.imageshack.us/img100/4103/capturedg.jpg
Thanks alot.

Please show me your work on these questions and I will help you in that

Question 3 :
CH3COOH is a weak acid

Acitivity of C = (0.01 CH3COOH)(ActivityCoefiictent)
pOH = -log[(0.01 CH3COOH)(ActivityCoefiictent) ]
pH = 14-pOH

Question 4 :
Since ph is already givin we cannot write a charge balance
But the mass balance will be :
CaF2(s) +Ca2 = 2F + F- + CaF+CaF2(s)

Correction tom y last post, weak acid then it should be ph not pOH

and question 5 , i already solved it.