stoltzfus_chem123_Midterm1_page3 - (b The basis for...

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10. [7 points] The main reason we use aqua regia in experiment #25 is __________. (a) to serve as an oxidizing agent. (b) to ensure the solution we are working with is distinctly acidic. (c) to aid in the formation of a precipitate by decreasing the solubility (d) to serve as a complexing agent. (e) both (a) and (d) 11. [7 points] A student performed laboratory tests on the solubility of slightly soluble salts A, B, and C in water as a function of temperature. The results of these tests were graphed and are shown below. Based on the data collected by this student, what can the student conclude about the data collected? 0 5 10 15 20 25 30 35 40 45 50 0 20 40 60 80 100 Temp. (C) Solubility (g/L) A B C (a) For all three salts, the temperature has a minimal effect on the solubility.
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Unformatted text preview: (b) The basis for separation of salt C from salts A and B is that salt C will dissolve in hot water and salts A and B will not. (c) In order to separate salts A and B, the precipitates should be heated in water and the resulting solution must be separated quickly from the remaining solid to avoid reprecipitation as the solution cools. (d) It would be easiest to separate salt A from salt C at low temperatures. (e) The data collected on solubility as a function of temperature shows there is not a practical way to separation any of the three salts and other tests such as pH dependence, complex ion formation, or the common ion effect must be performed in order to separate them....
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