Question

what is the molar concentration of a 10% nacl solution

Answer 1

Answer:

a 10% solution of NaCl is 10 grams NaCl in 100 ml water.

Answer 2

Given: Concentration of NaCl = 10%

To find: Molar concentration of NaCl

Solution: Let us take 1000ml of such a solution. (1 cubic cm=1ml)

Let consider the density of Sodium Chloride is 1 gram/ cubic meter.

Now, Density=Mass/Volume

 Mass= Volume*Density

= 1000×1 g = 1000g

Now, it is given that the solution contains 10% NaCl by mass.

Mass of NaCl = 1000×10/100 g = 100g

Molar mass of NaCl= 58.5g/mol

Numbers of moles of NaCl = 100/58.5 = 1.74 mol

Molarity = number of moles of solute/volume of solution (in liter)

                = 1.74 / 1 = 1.74

Therefore the molarity is 1.74

• Molarity is the measure of the concentration of a compound particularly of a solute in a solution, in terms of the number of moles in a unit volume of solution.

• Molarity is also known as molar concentration.