Need Some Chemistry Help

Question

What is the amount of H+ (aq) ions in 25.0 mL of 0.200 M hydrochloric acid?

a. 5.00 mol

b. 25.0 mol

c. 0.200 mol

d. 5.00 mmol

e. 25.0 mmol

Answer 1

0.200 M hydrochloric acid (HCl) means 0.200 mols HCl / liter of solution

25.0 ml HCl x 1 L / 1000 ml = 0.0250 L

moles HCl in 25.0 mls = 0.200 mols / L x 0.0250 L = 0.005 moles HCl

Since HCl ionizes completely => H⁺ and Cl^-, moles H⁺ = mols Cl^- = 0.005 mols H⁺

0.005 mols H⁺ x 1000 mmoles / mol = 5.00 mmoles H⁺ = answer d