Dilution Problem - Mixed category
9. Altering Product Strength 9.1) Dilution 9.1.1) Dilution
9.1.1.1) Find initial concentration in dilution Challenging 1
Total tried: Correct: Wrong:
What concentration of a 36.5 mL solution do you need to make 305.5 mL of a 3.76% solution?
Click on the button below to see the answer and explanations
Notice: Undefined variable: input_value1 in /home/jshzub/web/rxcal.org/public_html/practice/practice/includes/body.php on line 220
lb equals 31.5 % 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 = `36.5\quadmL`.
`C_1` = initial concentration = `?\quad%`
`Q_2` = final quantity = `305.5\quad mL`.
`C_2` = final concentration = `3.76\quad %`
Therefore, rearranging the formula, we get:
`C_1 = (Q_2 × C_2)/(Q_1)`
`therefore C_1 = (305.5 × 3.76) /36.5=31.5\quad%` (Ans.).