What is the molar analytical concentration of solute in an aqueous solution that is: 20.2% w/w HCl and has a density of 1.14 g/mL?

Answer 1

If you had 1 liter (1000 ml) of this solution, what would the mass be?

1000 ml solution x 1.14 g/ml = 1140 g of solution

If it is 20.2 % HCl by mass, then the mass of HCl would be 1140 g x 0.202 = 230.28 g = 230 g (3 sig. figs.)

Molarity = moles HCl/L solution

230 g HCl x 1 mol HCl/36.46 g = 6.31 moles

Molarity (M) = 6.31 M