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a4-1 - Chemistry 2000 Spring 2001 Section B Assignment 4...

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Chemistry 2000 Spring 2001 Section B Assignment 4 Due: Thursday, April 5, 10:50 a.m. Note: You may have to hunt around your textbook for relevant data. Most of the data you need can be found in the appendices. 1. Calculate the solubility of magnesium hydroxide in (a) neutral water [7 marks], and (b) a pH 4 buffer [4 marks]. 2. The solubility of GaF 3 is 0.02 g/L. 1 Calculate the solubility product of this compound. [6 marks] 3. Maple sugar is made by evaporating water from sap. Sugar maple sap is approximately 98% water by weight. (a) How much sap does it take to make 1 kg of maple sugar? [3 marks] (b) Maple sap is typically harvested at 5 C. How much heat would it take to produce 1 kg of maple sugar starting from sap at 5 C? Assume that the thermal properties of sap are similar to those of water. [6 marks] (c) In a traditional production facility, the heat required is provided by burning wood. Dry wood typically provides about 4 MJ of heat for every kg burned. Assuming that no heat is lost to the environment, how much wood must be burned to produce 1 kg of maple sugar? [2 marks]
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