A solution has a concentration of 0.025 M HCl. How many moles of H+ are present per liter in this solution? (Use the decimal form of your answer.)

• A. 0.25
• B. 0.0025
• C. 0.025
• D. 0.050

Answer: (C)

Verified step by step guidance

1. Identify the species that contribute H+ ions in the solution. Since HCl is a strong acid, it dissociates completely into H+ and Cl- ions in water.
2. Write the dissociation equation for HCl: \(\mathrm{HCl} \rightarrow \mathrm{H^{+}} + \mathrm{Cl^{-}}\).
3. Recognize that for every 1 mole of HCl dissolved, 1 mole of H+ ions is produced because the dissociation is complete and the ratio is 1:1.
4. Use the given concentration of HCl, which is 0.025 M, meaning 0.025 moles of HCl per liter of solution.
5. Since the molar ratio of HCl to H+ is 1:1, the concentration of H+ ions is also 0.025 moles per liter.