Chemistry help: if 300mL of the solution... pH question

If 300ml of the solution 0.0025M is taken and diluted to 5L, what is the pH?

I don't want the answer, but can you please explain how to do this, I don't get what the dilution part is about. I know how to do pH problems, but I'm confused about the first part. Please explain it to me! Thanks :D

So, pH=-log[H+], with [H+] meaning the concentration in molarity (moles/liter) of the solution. The more concentrated solution, the higher the pH will be. I'm not going to solve this for you, but i'll tell you how to do it. You would find the molarity of the new 5 L solution, and then use that as the concentration when finding pH.

You find the molarity of the 5 L solution by figuring out how many moles there are in the original 300 mL, and then dividing it by 5 L.

Need any more info, just ask and i'll reply.