Question

(3) You have a 5 M sucrose stock solution and need 90 mL of the three following solutions for your experiment: 0.5 M, 0.05 M, and 0.005 M sucrose, respectively. How will you prepare the 3 sucrose solutions you need? You can use a diagram to explain your answer.

Answer 1

Preparation of 90 mL of 0.5 M sucrose solution :

According to law of dilution   MV = M'V'

Where M = Molarity of stock = 5 M

V = Volume of the stock = ?

M' = Molarity of dilute solution = 0.5 M

V' = Volume of the dilute solution = 90 mL

Plug the values we get   , V' = MV /M'

= 9 mL

So take 9 mL of the stock solution and diluted it to 90 mL by using distilled water

Preparation of 90 mL of 0.05 M sucrose solution :

According to law of dilution   MV = M'V'

Where M = Molarity of stock = 5 M

V = Volume of the stock = ?

M' = Molarity of dilute solution = 0.05 M

V' = Volume of the dilute solution = 90 mL

Plug the values we get   , V' = MV /M'

= 0.9 mL

So take 0.9 mL of the stock solution and diluted it to 90 mL by using distilled water

Preparation of 90 mL of 0.005 M sucrose solution :

According to law of dilution   MV = M'V'

Where M = Molarity of stock = 5 M

V = Volume of the stock = ?

M' = Molarity of dilute solution = 0.005 M

V' = Volume of the dilute solution = 90 mL

Plug the values we get   , V' = MV /M'

= 0.09 mL

So take 0.09 mL of the stock solution and diluted it to 90 mL by using distilled water