Question

Prepare the following solutions by determiing the proper mass of solute (or volume in the case where you are working from a stock solution) that will need to be transferred to the volumetric flask. Use diemensional analysis where apporpriate to do so. Describe how you would make each solution.

a. 150.0 mL of .50 M hydrochorlic acid solution from a concetrated stock solution of 12.0M hydrochloric acid.

b. 250.0 mL of a 1.50 M solution of potassium permanganate.

c. 2.00 L of a 3.0 Molar solution of perchloric acid from a 5.0M stock solution of perchloric acid.

d. 500.0 mL of a .300 molar solution of calcium hydroxide.

Answer 1

a. M1V1= M2V2

150*0.5 = 12*v2

V2 = 6.25 ml

take 6.25 ml of stock solution and dilute it to 150 ml by addition of water.

b. Molarity = w/mwt*1000/v

   1.5 = (W/158.034)*(1000/250)

W = 59.26 grams

take 59.26 grams of KMnO4 and dissolve it in limited water and then make it to 250 ml solution .

c. 2*3 = 5*V2

v2 = 1.2 L

take 1.2 L of stock solution and add water up to 2 L.

d.

Molarity = w/mwt*1000/v

   3.0 = (W/100.46)*(1000/500)

W = 150.7 grams

take 150.7 grams of calcium hydroxide and dissolve it in limited water and then make it to 500 ml solution .