Question

tream REPORT FOR EXPERIMENT 9 (continued) NAME F. Solubility vs. Temperature; Saturated and Unsaturated Solutions Data Table: Circle the choices which best describe your observations. NaCl NH.CI 1.0 g + 5 mL water dissolved completely? yes/no saturated or unsaturated? dissolved completely? yes/no saturated or unsaturated2 1.0 g + 5 mL water +1.4 g 2.4 g + 5 ml water + heat 2.4 g + 5 mL water after cooling dissolved completely? yes/no saturated or unsaturated? dissolved completely? yes/no saturated or unsaturated? dissolved completely? yes no saturated or unsaturated? dissolved completely? yes/no saturated or unsaturated? dissolved completely? yes/no saturated or unsaturated? dissolved completely? yes/no saturated or unsaturated? G. Ionie Reactions in Solution 1 Write the word and formula tion

A. What is the percentage by mass of NaCl in saturated solution of sodium chloride at 50°C?

B. Calculate the solubility of potassium bromide at 23°C? Hint: assume that the solubility increases by an equal amount for each degree between 20°C and 30°C?

C. A saturated solution of barium chloride at 30°C contains 150g water. How much additional barium chloride can be dissolved by heating this solution to 60°C?

Answer 1

Part A.

36.69 g/100 ml is the solubility of NaCl at 50 ^oC.

To obtain % by mass, you take the mass of NaCl divided by the total mass * 100

Density of H₂O at 50^o is about 0.988 g/mL

i.e. 100 ml H₂O at 50^o = 100 mL x 0.988 g/mL = 98.8 g

Mass of NaCl = 36.69 g

Total mass = 36.69 g + 98.8 g = 135.49 g

mass % NaCl = (36.69 g/135.49 g) * 100 = 27.1%