Preamble 1: 1/29/07
You have 4 glasses of water.�� In which cup will a teabag dissolve the quickest?� In which cup will an ice cube melt the fastest?� In which cup will a � teaspoon of salt dissolve the quickest?� Rank the cups for each of those situations.
1. 300mL at 25 deg C����2. 300mL at 85 deg C
3. 50mL at 25 deg C������4. 50mL at 85 deg C
Preamble 2: 1/30/07
You have a sugar solution of a certain concentration (call this solution A).� You pour 1/4 of this solution into a beaker, and add an equivalent volume of water (call this solution B)
1) What is the ratio of amount of sugar between A and B?
2) What is the ratio of volumes between A and B?
3) What is the ratio of concentrations between A and B?
4) How much water would you add to A to create the concentration of B?
Now, assume that solution A started with a volume of 155mL and 13g of glucose (C6H12O6) dissolved in it.
Calculate the concentration of solution A and B in the following concentration types:
Mass percent
Molarity
Molality
Preamble 3: 1/31/07
What are some of your ideas/knowledge about solubility, dissolving, and solutions? What are some of your questions about those topics?
How do you think volume and temperature will relate to the solubility of salt?
Preamble 4: 2/6/07
You need to make 535 mL of a sugar solution with a concentration of 2.324 x 10 ^-3 M.� However, you have solutions of various concentrations and volumes to start with.� How much of each solution and water will you need to combine together?
A) 1.1 L of 1M solution
B) 300. mL of 2.2 x 10 ^-2 M solution
C) 50. mL of 3M solution
D) 66 mL of 1.32 x 10 ^-1 M solution
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