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10 mL of 2 M NaOH solution is mixed with 200 mL of 0.5 M NaOH solution. What is the final concentration of NaOH?

1. 0.57 M
2. 5.7 M
3. 11.4 M
4. 1.14 M

Correct answer: 0.57 M

Solution

Total moles = 0.010*2 + 0.200*0.5 = 0.12 mol in 0.210 L, giving 0.57 M.

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