Question

You measure the absorbency of a 0.5 ml solution and you find that it is 1.2. You then dilute this solution by adding 0.5 ml of pure water, making the final volume 1.0. What will be the absorbency of the diluted solution? A. 2.4 B. 1.2 C. 0.6 D. 0.3 E. 0.0

Answer 1

The absorbency will be 0.6 (letter C)

Step-by-step explanation:

A process that decreases the amount of a solute in a solution is called dilution. Dilutions are made by adding more solvent to the solution (the universal solvent is water).

In this case, we have a 0.5 ml of a solution with a specific concentration that the absorbency is 1.2. We dilute this solution adding 0.5 ml of water (the same amount of our solution or initial volume). Then we have the double (1 mL) of the initial volume (0.5 ml), this means that the concentration will be the half (0.6) of our initial concentration (1.2).

In mathematical terms, we can use the next formula :

(C1)(V1) = (C2)(V2)

Where:

C1: initial concentration

V1: initial volume

C2: final concentration

V2: final volume

We now that:

C1: 1.2

V1: 0.5 ml

C2: ?

V2: 1 ml

Using the formula, we have:

(1.2)(0.5 ml)=(C2)(1 ml)

As the 1 ml is multiplying, pass to the other side dividing

C2= (1.2)(0.5 ml) /(1 ml)

C2= 0.6 /1

C2 : 0.6