A1.0 m solution of hydrochloric acid is mixed with an equal volume of sodium hydroxide solution. the resulting solution turns ph paper blue, meaning the solution is basic. which of the following concentrations would be consistent with the experimental results for sodium hydroxide?
a. 1.0 m
b. 2.0 m
c. 0.5 m
d. 0.25 m

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.