A physician asks you to prepare and dispense a stock solution of copper sulfate

Question

A physician asks you to prepare and dispense a stock solution of copper sulfate in water to be diluted by his patient and used as a bath for soaking his feet. How many grams of copper sulfate (MW = 159.61) would be required to prepare 500 ml of a stock solution such that 1 tablespoonful (15 ml), when diluted to a volume of 1 liter, gives a 1: 5000 solution? How much does the final mixture weigh? How many milliliters of a drug are required to prepare 2.5 liters of a 17% (v/v) solution? What is the Percentage Strength (v/v) of a solution containing 17 milliliters of drug in 340 ml of solution? What Volume (ml) of a 10 % (w/v) solution can be prepared from 10 grams of drug? Express 0.04 as a ratio strength Express 1: 5000 a as percentage strength Convert product ratio strength to mg/m1 rightarrow 1: 5000 (w/v)

Explanation / Answer

6) weight = volume* specific gravity

Total weight = 60*0.902 + 36*0.788+36*0.785+68*1 = 178.745

7)

Total = 2.5 liter

drug %=17 %

thus we know that drug % = drug vol / 2.5

0.17 = drug vol /2.5

drug vol = 0.17 *2.5 = 0.425 liter

8)

percentage strength = 17/340 *100=5%

9) 10 % (w/v) = 10 gram / volume

volume= 10/0.1 = 100 liter

10) 0.04 = 4/100 = 4%

11) 1:5000

% strength = 1 /(1+5000) * 100 = 100/5001=0.0199 %

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