Question

A lab technician wished to determine mass of acetylsalicylic acid in a commercial tablet aspirin. The titrate samples of the acetylsalicylic acid with 0.124 M NaOH solution. How do I determine the mass of ASA in milligrams? The mole ratio between sodium hydroxide and ASA is 1.1

Answer 1

First of all determine amount of NaOH used (mole) which is equal to the amount of acetylsalicylic acid used then multiply with RMM of acetylsalicylic acid (180.158 g/mol).