250 mL of 0.1 M is mixed with 500 mL of 0.2 M . The molarity of the final solution is: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
250 mL of 0.1 M $K_2Cr_2O_7$ is mixed with 500 mL of 0.2 M $K_2Cr_2O_7$. The molarity of the final solution is:
Answer: B
💡 Solution & Explanation
$M = (M_1V_1 + M_2V_2) / (V_1 + V_2) = (0.1 \times 250 + 0.2 \times 500) / 750 = (25 + 100) / 750 = 125/750 = 1/6 \approx 0.166 \text{ M}$.
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