Question

What is the molarity of a saline contact solution that contains 5.90 g of Sodium chloride

in 473 mL of solution?

Answer 1

0.213M

Step-by-step explanation:

Given parameters:

Mass of sodium chloride = 5.9g

Volume of solution = 473mL = 0.473L

Unknown:

Molarity of solution = ?

Solution:

Molarity is one of the ways of expressing concentration.

It is defined as the number of moles of solute in a given solution;

mathematically;

Molarity =
`(number of moles )/(volume)`

Number of moles of NaCl;

Number of moles =
`(mass)/(molar mass)`

molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Number of moles =
`(5.9)/(58.5)` = 0.1moles

Molarity =
`(0.1)/(0.473)` = 0.213M