Question

How many grams of NaCl (molecular weight = 58.4 g mole-1) would you dissolve in water to make a total volume of 500 mL of solution to produce a 0.5 M solution of NaCl?

Answer 1

Given :

Volume , V = 500 mL .

Molarity , M = 0.5 M .

Molecular mass of NaCl is
`58.4\ g/mole` .

To Find :

How many grams of NaCl is required .

Solution :

Let , NaCl required is x gram .

Molarity is given by :

`M=\frac{\text{Number of moles}}{\text{Volume (in liters) }}\\\\M=(m)/(M* V)\\\\0.5=(x)/(58.4* 0.5)\\\\x=0.5^2* 58.4\ g\\\\x=14.6\ g`

Hence , this is the required solution.