You must dilute a 5X stock solution of a hydrogen peroxide to 500 mL to dispense...

Question

Question

You must dilute a 5X stock solution of a hydrogen peroxide to 500 mL to dispense a 5 % solution.

a. How much of the 5X stock do you need?

b.What is the concentration of the 5X stock solution?

Answer 1

Answer #1

In general, in the laboratory, when we are given 5X stock solution it means we have to dilute it to 1X stock solution before using.

In our case, we have to dilute the 5X stock solution to 5% solution, we can assume that here 1X = 5%

a) Thus, applying V₁S₁ = V₂S₂

V₁ x 5X = 1X x 500,

V₁ = 500 x 1X / 5X = 100 mL

Thus, volume of the 5X stock needed is 100 mL

b) And let's say concentration of 5X solution is y%,

Then, y x 100 = 5 x 500

y = 2500/100 = 25%

So, concentration of the 5X stock solution is 25%.

Answer 2

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