Question

1) A pharmacist attempts to weigh 100 milligrams of codeine sulfate on a balance with a sensitivity requirement of 4 milligrams. Calculate the maximum potential error (nearest hundredth) in terms of percentage (%).

2) A 10-milliliter graduate weighs 42.745 grams. When 6 milliliters of distilled water are measured in it, the combined weight of graduate and water is 48.540 grams. By definition, 6 milliliters of water should weigh 6 grams. Calculate the weight of the measured water and express any deviation from 6 grams as percentage of error (%, to the nearest hundredth).

3) What volume error (in mL, round to the nearest tenth) would occur in the measuring of 30 mL of a liquid ingredient if the improperly calibrated measuring device created a 18 % error in all measurements?

4)A chemist measured 77 mL using a graduated cylinder. Based on her experience, the volume did not seem to be correct. This volume was again measured using a calibrated standard device, from which it was determined that the volume of the liquid was actually 67.5 mL. What is the % error in this measurement? (% answer to the nearest hundredth

Answer 1