Practice problems
| # | Question |
|---|---|
| 1 | The maximum percentage error allowed is 4 % and the balance states the sensitivity requirement is 5 mg. What is the minimum weighable quantity? |
| 2 | What is the maximum percentage error in weighing 226 mg of drug on a balance with a sensitivity requirement of 3 mg? |
| 3 | A pharmacist weighs 656 mg of a substance on a balance, he then weighs it again on a more sensitive balance. Second balance reads 208 mg. Calculate the percentage error in the original weighing. Is this percentage error acceptable according to the USP standards? |
| 4 | Calculate the SR of a prescription balance if 22 mg on this balance was able to move the pointer by 3 divisions. Does this satisfy class A prescription balance requirement? |
Answers
The Answer to question 1 is: 125.00 mg
The Answer to question 2 is: 1.3 %
The Answer to question 3 is: 68.3 %; No not acceptable as it is more than 5 %
The Answer to question 4 is: a) 7.33 mg b) No, this does not satisfy Class A prescription requirement.