How do I answer this chemistry question?

Question

5ml of 0.1 mol.L-1 nitric acid solution is diluted to 100ml by adding 95mL of water.

Calculate [H ] in the diluted solution.

Thanks.

Answer 1

[H]  =  [HNO3]

This is true because the nitric acid is a strong acid, meaning there is no undisassociated acid in water, so all your protons come from the acid.

You simply need to calculate the concentration of the acid in moles per liter of the diluted solution.