Question

What volume of water should be used to dissolve 19.6 g of LiF to create a 0.320 M solution?

Answer 1

2.4 litters of water are required.

Explanation:

Given data:

Mass of LiF = 19.6 g

Molarity of solution = 0.320 M

Volume of water used = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 19.6 g/ 26 g/mol

Number of moles = 0.75 mol

Volume required:

Molarity = number of moles/ volume in L

Now we will put the values in above given formula.

0.320 M = 0.75 mol / volume in L

Volume in L = 0.75 mol /0.320 M

M = mol/L

Volume in L = 2.4 L