What quantity of a 30% solution do you need to make 150 ml of a 20% solution?
a. 100 ml
b. 50 ml
c. 150 ml
d. 200 ml

Volume required = 100mL

Step-by-step explanation:

Let the volume of 30% solution required be = V mL

Amount of solute in V mL of solution = 30% of V = 0.3V(i)

This amount is also present in 150 mL of 20% solution

For 150 mL of 20% solution we have amount of solute = 150 mL X 20%

                                                                                          = 30(ii)

Thus equating i and ii we get

0.3V = 30

Thus V =100 mL

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