Concentration of Solutions Quiz

Question

1) a) What volume of 0.375 mol/L potassium carbonate could be prepared if you diluted a 

        975.0 mL solution with a concentration of 0.850 mol/L? (3 marks)

b) What volume of water would have to be added to prepare this solution? (2 marks)

2) Your blood contains about 0.72 % (V/V) white blood cells (leukocytes), which are essential 

    for fighting infections. Assuming you have a blood volume of about 4.0 L, what volume of 

    pure leukocytes is present

Answer 1

1a). V1M1 = V2M2

V1 = initial volume = 975.0 ml

M1 = initial concentration = 0.850 mol//L

V2 = final volume = ?

M2 = final concentration = 0.375 mol/L

(975 ml)(0.850 mol/L) = (V2)(0.375 mol/L)

V2 = 2210 mls

1b). you would have to add 2210 - 975 = 1235 mls of water

2). 4.0 L x 0.72% WBC = 4.0 L x 0.0072 = 0.0288 L of leukocytes