Question

Order: 100 ml of 10% formalin solution. On hand: formaldehyde 37% (considered the same as 100% formalin). Amount needed: _____.

a) 27.03 ml
b) 25 ml
c) 20 ml
d) 10 ml

Answer 1

The amount of formaldehyde needed is 27.03 ml.

Step-by-step explanation:

To calculate the amount of formaldehyde needed, you can use the formula:

Amount needed (ml) = (Volume of formalin (ml) × Percent concentration of formalin) / Percent concentration of formaldehyde

Plugging in the given values:

Amount needed = (100 ml × 10%) / 37% = 27.03 ml

So the correct answer is (a) 27.03 ml.