Ontario Registered Pharmacy Technician (RphT) Practice Exam

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How many 30mg KMNO4 (Potassium Permanganate) tablets are needed to make the following solution? KMNO4 1:5000, 600mL

  1. 2 tablets

  2. 3 tablets

  3. 4 tablets

  4. 6 tablets

The correct answer is: 4 tablets

To make a KMNO4 solution with a concentration of 15000, you need to dissolve 1 part KMNO4 in 5000 parts of solution (600mL = 600000 parts). So, for this solution, you would need to dissolve 1 tablet (30mg) in 600000mL. Since we are working in milliliters, we need to convert the 30mg to milliliters as well, which comes out to be 0.03mL. Dividing 600000mL by 0.03mL gives us 20000. Therefore, the correct answer is C: 4 tablets. Option A and B are incorrect because they are too low and would result in a more concentrated solution. Option D is incorrect because it is too high and would result in a more diluted solution.

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