How much of a 1:1000 stock is needed to make a 360ml of a 1:2400 solution?

by Georgette
(Charleston, SC, USA)

Pharmacy Ratio / Dilution Question

Pharmacy Ratio / Dilution Question

How much of a 1:1000 stock is needed to make 360 ml of a 1:2400 solution?
Also, how much water is required?

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by: Anton

So, we are given "1:1000" stock.

This is equivalent to 1/1000.

We want to follow the following equation to solve this question:

Amount of strength req'd
Stock Req'd = -------------- X Volume Req'd
stock req'd

So, we plug in the variables to see what we come up with:

1/2400
------ X 360ml = Amount of Stock Req'd
1/1
1/2400
0.15ml = -------- X 360ml
1/1

The final equation we use in this question is the following:

Water Req'd = Volume req'd X Stock Req'd

360ml X 1.5ml = Water Req'd

54ml = Water Required

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