Question

HCI is a strong acid. What is the ion concentration, (H+), of a 0.0015M solution of HCI? What is the pH of a 0.0015M solution of HCI?

I have looked in my book but it not making sense. I am not sure where to even start the problem. A little guidance please

Answer 1

Not much else to do than to work the problem. The point you are missing is that it's a strong acid. Strong acids ionize 100% so ALL of the HCl molecules end up as ions and NONE are in the form of HCl molecules. It isn't necessary to do an ICE chart but that might help a little.
.........HCl --> H^+ + Cl-
I.....0.0015.....0.....0
C....-0.0015....0.0015..0.0015
E........0......0.0015..0.0015

So the (H^+) = (Cl^-) = 0.0015M and you convert that to pH.