MathDB

5

Part of 2013 National Chemistry Olympiad

Problems(1)

2013 USNCO Problem 5: Hydroxide Concentration

Source:

5/23/2013
A mixture is prepared by adding 50.050.0 mL of 0.2000.200 M \ce{NaOH} to 75.075.0 mL of 0.1000.100 M \ce{NaOH}. What is the $$$[OH^-]$ in the mixture?
$ (A) \text{0.0600 M}\qquad(B) \text{0.0800 M}\qquad(C) \text{0.140 M}\qquad(D) \text{0.233 M}\qquad$