Question

Perform the following calculations. 20 g of common salt (NaCl) is dissolved in water to

make 1.0 L (1000g) saline solution. Calculate the concentration of the solution in
a) Grams per liter

b) Molarity

c) Part per million (ppm)

d) Percentage composition

Answer 1

Step-by-step explanation:

A) The concentration = The mass of the solute/the total volume

=m/v

= 20g/1L

B) The concentration = n/v

first we have to find the number of moles in 20g of NaCl

n=m/M

n=20mol/58.5

1000cm^3=1000ml

1000cm^3=1dm^3

C=n/v

= 20/58.5

= 0.341
`moldm^(-3)`

c) 20g*10^6/1000g

=20000ppm

d)20*100/1000 = 2%