Subject - Chemistry:

Basics

MCQ - 270-2456

Question:

If 10.mL of 1 M HCl was required to titrate a 20.mL NaOH solution of unknown concentration to its end point, what was the concentration of the NaOH?

0.5 M
1.5 M
2 M
1.5 M

Correct Answer: A

Explanation:

Use the equation Macid × V2 = Mbase × Vbase and change mL to L by dividing by 1,000 mL/L to change 10. mL into .01 L and 20. mL into .02 L. Then substituting, you get 1 Macid × .01 Lacid = xMbase × .02 Lbase. Solving for x, you get x = 0.5 Mbase.

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