# Practice-Solution Concentrations

Practice-Solution Concentrations

1. How much HCl will be needed to produce a 550 ml of a 3.0 M solution (60.14 g)

2. What is the molality of KCl solution when 65.0 g of KCl is dissolved in 400 ml of water? (Hint: 1 g of water = 1 ml of water) (2.18 m)

3. An sample of water was found to have 0.0075 g of an unknown toxin in a 500 ml sample of water. Determine the concentration of this unknown toxin in ppm. (15 ppm)

4. For a lab, 455 ml of a 3.0 M NaOH solution is needed. There is only a solution of 4.5 M NaOH. How many liters of the 4.5 M NaOH is needed to make the needed solution?( 0.303 L)

5. Calculate the % composition of:

a. Hg in Hg2Cl2 (85%)

b. P in Ba3(PO4)2 (P= 10%)

6. Write a balanced chemical equation when the following aqueous solutions combine, including all phases, and determine the precipitate.

a. Ca(ClO3)2 + KCO3

b. CaCl2 + AgNO3

c. Na3PO4 + Fe(NO3)3

d. potassium sulfide + copper(II)sulfate

Practice-Solution Concentrations

1. How much HCl will be needed to produce a 550 ml of a 3.0 M solution (60.14 g)

2. What is the molality of KCl solution when 65.0 g of KCl is dissolved in 400 ml of water? (Hint: 1 g of water = 1 ml of water) (2.18 m)

3. An sample of water was found to have 0.0075 g of an unknown toxin in a 500 ml sample of water. Determine the concentration of this unknown toxin in ppm. (15 ppm)

4. For a lab, 455 ml of a 3.0 M NaOH solution is needed. There is only a solution of 4.5 M NaOH. How many liters of the 4.5 M NaOH is needed to make the needed solution?( 0.303 L)

5. Calculate the % composition of:

a. Hg in Hg2Cl2 (85%)

b. P in Ba3(PO4)2 (P= 10%)

6. Write a balanced chemical equation when the following aqueous solutions combine, including all phases, and determine the precipitate.

a. Ca(ClO3)2 + KCO3

b. CaCl2 + AgNO3

c. Na3PO4 + Fe(NO3)3

d. potassium sulfide + copper(II)sulfate