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Some Basic Concepts of Chemistry
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11/08/2021 10:38 am
Topic starter
10 mL of 2 M NaOH solution is added to 200 mL of 0.5 M of NaOH solution. What is the final concentration?
(a) 0.57 M
(b) 5.7 M
(c) 11.4 M
(d) 1.14 M
1 Answer
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11/08/2021 10:46 am
Correct answer: (a) 0.57 M
Explanation:
From molarity equation
\(M_1V_1 + M_2V_2\) = MV(total)
2 x \(\frac{10}{1000}\) + 0.5 x \(\frac{200}{1000}\) = M x \(\frac{210}{1000}\)
120 = M x 210
M = \(\frac{120}{210}\) = 0.57 M