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☆ An antacid pill contains only magnesium hydroxide and aluminum
hydroxide as the active ingredients. The mass of chloride salts
resulting from the modification reaction of the active substances in a
sample, which was obtained by evaporation and filtration from
titration by 48.5mL of 0.187 M hydrochloric acid, is 0.4200 g, what is
the weight percentage of magnesium hydroxide in the studied
sample?
L

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.