As you sit on a dock, you notice a wave crest pass. You count another 10 wave crests in the next 15 seconds. What is the frequency of these waves?
A. 10 Hz
B. 15 HZ
C. 0.667 Hz
D. 1.5 Hz

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.