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The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 mL of 2 M HCl will be:

1. 0.875 M
2. 1.00 M
3. 1.75 M
4. 0.975 M

Correct answer: 0.875 M

Solution

To find the molarity of the mixed solution, we calculate the total moles of HCl from each solution and divide by the total volume of the mixture. The moles from the first solution (0.5 M) and the second solution (2 M) are combined, and the total volume is 1000 mL, resulting in a final molarity of 0.875 M.

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