Question

a scientist makes an acid solution by adding drops of acid to 1.2 l of water. the final volume of the acid solution is 1.202 l. assuming the volume of each drop is 0.05 ml, how many drops were added to the water? about what percent of the acid solution is acid?
find the number of drops of acid that were added to the solution
(simplify your answer.)

Explanation:

Step1: Find volume of acid added

First, convert all volumes to the same unit (mL). 1 L = 1000 mL. So, 1.2 L of water is 1.2×1000 = 1200 mL and 1.202 L of the final solution is 1.202×1000 = 1202 mL. The volume of acid added is the final - volume of water, which is 1202 - 1200 = 2 mL.

Step2: Calculate number of drops

Since the volume of each drop is 0.05 mL, the number of drops $n=\frac{\text{Volume of acid}}{\text{Volume per drop}}=\frac{2}{0.05}=40$.

Answer:

40