A student performed a caffeine extraction on two Vivarin tablets, which are advertised to contain 200 mg caffeine in each 2 g tablet. The student follows the lab extraction protocol and weighs 328 mg of caffeine, wet. What is the crude percent isolation (or percent recovery) for this extraction

Enzymes affect the reactions in living cells by changing the

  the mississippians were considered to be  horticulturalists, which means they were

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.