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Question:

what can be observed between the coagulation of these materials?

here was the procedure: to each of three test tubes place 5mL of the hydrous ferric oxide solto the first test tube, add two drops of 0.5N aluminum chloride solution, to the second, 2 drops of 0.5N sodium chloride solution and to the third, two drops of 0.5N sodium sulfate solution, shake each test tube and set aside.observe each test tube carefully, accoriding to the time requred for coagulation and the extent of coagulation.

Answer:

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What can be observed is: 1) each tube either does or does not coagulate, 2) for those that do, how long does it take, which is the fastest, which is the slowest, and 3) what does the precipitate look like (is it diffuse? what color? does it settle?) Important facts to bear in mind in interpreting your observations: a) AlCl3 is a powerful Lewis acid, whereas NaCl and NaSO4 are neutral (or very close to neutral) salts, and b) metal chlorides typically have lower solubilities than metal sulfates.

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