Question

If 17.8 mL of a 4.07 M KBr solution are diluted to a final volume of 0.670 L, what is the final concentration (molarity)?

Answer 1

0.108 M.

Step-by-step explanation:

What is given?

Concentration 1 (C1) = 4.07 M.

Volume 1 (V1) = 17.8 mL = 0.0178 L.

Volume 2 (V2) = 0.670 L.

What do we need? Concentration 2 (C2).

Step-by-step solution:

To solve this type of problem, we use the following formula:

`C_1V_1=C_2V_2.`

Where C is concentration and V is volume. We want to find the final concentration, in this case, C2 would be the final concentration, so let's solve for this unknown value and replace the given data:

`C_2=(C_1V_1)/(V_2)=\frac{4.07\text{ M}\cdot0.0178L}{0.670L}=0.108\text{ M.}`

The final concentration would be 0.108 M.