1. You are given three bottles labeled a, b, AND c. The bottles contain pentane
ID: 610729 • Letter: 1
Question
1. You are given three bottles labeled a, b, AND c. The bottles contain pentane (C5H12, a liquid), calcium chloride (CaCl2) solution, and aqueous ammonium hydroxide (NH4OH, ammonia dissolved in water). Describe a procedure to identify which liquid would be in each bottle.
2.The device used in this experiment only measured the relative conductivity of the solution tested, that is, whether the solution contained a strong, weak or non-electrolyte. A more elaborate conductivity meter can determine a numerical value that can be related to the number of ions in solution. Arrange the following 0.1 M solutions in order of increasing conductivity and explain why you chose this order.
0.1 M FeCl3
0.1 M MgCl2
0.1 M NaCl
0.1 M glucose (C6H12O6)
Explanation / Answer
electrolysis: both the calcium chloride and ammonium hydroxide should be strong electrolytes combustion test: only the pentane should be flammable pH paper, or pH meter: the calcium chloride will have a neutral pH, where as the ammonium hydroxide will be basic. 2. 0.1M FeCl3 most ions (4) 0.1M MgCl2 next most ions (3) 0.1M NaCl fewest ions (2) 0.1M glucose no ions (non-conductive)
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