Question

What volume of 7.25 mol/L stock solution in needed to make 3.84 L of 8.50 mol/L solution?

Answer 1

Answer:

4.50 L

Explanation:

First we calculate how many moles are there in 3.84 L of a 8.50 mol/L solution:

• 3.84 L * 8.50 mol/L = 32.64 mol

Now, keeping in mind that

• Concentration = Mol / Volume

we can calculate the volume of a 7.25 mol/L solution that would contain 32.64 moles:

• Volume = Mol / Concentration

• Volume = 32.64 mol ÷ 7.25 mol/L

• Volume = 4.50 L

So we could take 4.50 L of the 7.25 mol/L solution and evaporate the solvent until only 3.84 L remain.