CHEMISTRY
posted by sabrina .
cell diagram:H2(g,1atm) Pt
Enter part(a), (c) with 2 siginificant digits and part(b) with 3 siginificant digits.
Enter scientific notation as 1.23E4.
(a) What is Ecell if the unknown solution in the halfcell on the left has pH = 4.94?
____________
(b) What is Ecell if the unknown solution in the halfcell on the left is 0.03890 M HCl?
____________
(c) What is Ecell if the unknown solution in the halfcell on the left is 0.194 M HA, where HA represents a weak acid with Ka = 1.8x10−5?

I see part of a cell diagram but not a complete cell diagram. I suspect on the half cell I see it is missing H^+.