What is the hydrogen ion concentration, in mol dm−3, when 2.00 g of sulfuric acid is dissolved in water to give 0.400 dm3 of solution?

Answer 1

How advanced is this class? I suppose the beginning class you would expect
mols H2SO4 = grams/molar mas = about 0.0510. Two mols H^+/mol H2SO4 = (H^+) = 2*0.0510. However, in reality, the second H in H2SO4 is not a strong acid as is the first one so it contributes only a minimal amount of H^+ and the (H^+) actually is 0.0510 from the first H + 0.00855 from the second. Add them for the total (but watch the number of significant figures). I can show you how to do the more advanced calculation if you are to go that route.

Answer 2

Thanks- I think I've cracked it x