Question

1) Using an aliquot factor of 6 to determine the mass of drug to weigh , if 1456 mg of total mixture was then made, what mg quantity of mixture would then contain the desired quantity of drug (i.e. what mass of mixture is to be weighed in the final aliquot method step

2) For a balance with a sensitivity requirement = 5 mg and for an error of 6.0 %, what mass of drug is to be weighed in step 1 when using the LWQ method? Express answer as a whole number.

3) When using the LWQ method, a chemist needs to obtain 40 mg of a drug using a balance that has a MWQ of 140 mg. If the desired quantity of drug is to be contained in a mixture mass of 210 for the last step, what mass of diluent (in mg) is to be weighed by the pharmacist?

Answer 1