The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 mL of 2 M HCl will be
A.
0.875 M
B.
1.00 M
C.
1.75 M
D.
0.0975 M
Show answer and solution
Correct option: A
Solution
Moles of HCl = (0.750 L × 0.5 M) + (0.250 L × 2 M) = 0.375 + 0.500 = 0.875 mol. Total volume = 750 + 250 = 1000 mL = 1 L. Molarity = 0.875 mol / 1 L = 0.875 M.
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