Question

Your apple juice has a molarity of 3.4 M and a volume of 0.895 litres. What does a student have to do to decrease the molarity to 0.587 M to make it less concentrated?

Answer 1

4.285 L of water must be added.

Step-by-step explanation:

Hello there!

In this case, for this dilution-like problems, we need to figure out the final volume of the resulting solution so that we would be able to obtain the correct volume of diluent (water) to be added. In such a way, we can obtain the final volume, V2, as shown below:

`M_1V_1=M_2V_2\\\\V_2=(M_1V_1)/(M_2)`

Thus, by plugging in the initial molarity, initial volume and final molarity (0.587 M) we obtain:

`V_2=(3.4M*0.895 L)/(0.587M)\\\\V_2=5.18L`

It means we need to add:

`V_(H_2O) ^(added)=5.18L-0.895L=4.285L`

Of diluent water.

Regards!