Dilution Problem - Find Initial Concentration
9. Altering Product Strength 9.1) Dilution 9.1.1) Dilution
9.1.1.1) Find initial concentration in dilution Easy 1
Total tried: Correct: Wrong:
What concentration of a 36 mL solution do you need to make 123 mL of a 11.27% solution?
Click on the button below to see the answer and explanations
lb equals 38.5 % kg
-
This is a volume expansion or concentration dilution type problem. The essential formula is `Q_1C_1 = Q_2C_2`.
Here,
`Q_1` = initial quantity = `36\quadmL`.
`C_1` = initial concentration = `?\quad%`
`Q_2` = final quantity = `123\quad mL`.
`C_2` = final concentration = `11.27\quad %`
Therefore, rearranging the formula, we get:
`C_1 = (Q_2 × C_2)/(Q_1)`
`therefore C_1 = (123 × 11.27) /36=38.5\quad%` (Ans.).