Which of the following solutions contains the greatest number of moles of H+(aq) ions?

• A. 50 mL of 0.2 M HCl
• B. 200 mL of 0.05 M HCl
• C. 150 mL of 0.05 M HCl
• D. 100 mL of 0.1 M HCl

Answer: (A)

Verified step by step guidance

1. Identify that HCl is a strong acid and dissociates completely in aqueous solution, so the concentration of HCl equals the concentration of H\textsuperscript{+} ions.
2. Recall the formula to calculate moles of solute: \(\text{moles} = \text{molarity} \times \text{volume (in liters)}\).
3. Convert the given volumes from milliliters to liters by dividing by 1000, since molarity is in moles per liter.
4. Calculate the moles of H\textsuperscript{+} ions for each solution using the formula: \(\text{moles H\textsuperscript{+}} = M \times V\) (in liters).
5. Compare the calculated moles of H\textsuperscript{+} ions for all solutions to determine which one has the greatest number.