Inorganic Chemistry Answers

Calculate the freezing point depression and boiling point elevation of a solution

containing 4.27g of Sucrose(C12H22O11) and 50.0g of water. (10 pts)

Kf = 1.86 oC

molal

and Kb=0.512 oC

molal

Throat spray is used in relieving pain and irritation caused by sore throat, sore

mouth, or canker sores. It is composed of a diluted solution of Phenol in water.

The mass percent of the usual throat spray is 1.40% C6H5OH in water. The density

of the Phenol solution and Water are known to be 0.9956 g/ml and 1.00 g/ml

respectively. Calculate the Molarity of the solution. (10 pts)

As part of the analysis of water samples, the hardness of water is commonly

measured and calculated. It is commonly expressed in ppm by mass (parts per

million) of CaCO3. Parts per million is also equivalent to milligrams of CaCO3 per

liter of water. In a sample taken by an environmentalist, he was able to observe

a hardness count of 205 mg CaCO3/L. Given this hardness count of the sample,

what is the molar concentration of Ca2+ ions in the water sample? (5 pts)

A Mixture Contains 1.5 Liters Oxalic Acid H2C2O4· 2H2O (ρ=1.653 g/mL) and 2-

gallon Water. Determine:

ρ Oxalic acid = 1.653 g/mL

ρ water = 1000 g/L

a) %w/w, %w/v, %v/v of oxalic acid in a solution (6 pts)

b) ppm and ppb of oxalic acid (4 pts)

c) Molarity, Normality, and molality of the solution (10 pts)

14. A NC Coastal Plain organic soil has a pH of 4.5 and a CEC = 30 meq/100g. What lime rate would you recommend?  A dealer sells 80% CCE lime with the following characteristics: 50% < 60 mesh; 30% < 8-60 mesh; 20% > 8 mesh. How much lime material would you apply? Use pH-BS diagram below and show all work.

11. A golf course manager has a golf green that is thinning. A soil test indicates that the following:

CEC = 4 meq/100g            800 ppm Ca (soil)

pH = 8.4                                 48 ppm Mg (soil)

EC = 8 mmhos/cm             78 ppm K (soil)

                                                230 ppm Na (soil)

What would you recommend (lbs/1000ft²)? Show all calculations