You want to prepare 50 mL of a 20% NaCl salt solution from a 100% stock....

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Question

You want to prepare 50 mL of a 20% NaCl salt solution from a 100% stock....

You want to prepare 50 mL of a 20% NaCl salt solution from a 100% stock. Calculate the amount of stock as well as the amount of water you need to use to make this dilution. Assume that you have unlimited volume of the stock.

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Answer 1

Answer #1

final volume=50 mL (V2)

concentration of stock solution=100% (M1)

concentration needed=20% (M2)

we have to find out the concentration of stock solution needed (V1)

we can use the formula M1V1=M2V2

V1=M2V2/M2

= (50 20)/100

= 10 mL

so we need to take 10 mL from the stock and add 30 mL of water to it to make 50 mL of 20% NaCl solution.

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Answer 2

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