5. When all of the sample to be collected has left the column, will the drop of solution coming off the tip of the column be acidic, basic or neutral?
6. How many H+ ions would be displaced from the ion exchange column by 1 Cu2+ ion?
7. Binding sites on the ion exchange resin are saturated with which ion before the sample solution is added?
8. Ions are displaced from the resin binding sites by any ion that has a higher what
Homework Answers
A#5: When all of the sample to collected has left the column the drop of solution coming of the tip is neutral because until the all of the sample mobilizes through the ion exchange column all the Cu2+ ions would bind to the resin and release H+. When the sample left the column (no sample) there will not be any exchange as a consequence H+ will not be liberated any more. Thus the solution coming of the tip would be neutral (PH = 7 the value of deionized water).
A#6: Cu2+ has 2+ charge and H+ has +1 charge. Therefore, a single Cu2+ ion will take the place of 2 H+ ions. The answer is 2 H+ ion will be dispalced by 1 Cu2+ ion in the ion exchange column.
A#7: The ion sites are negativey charged and they are saturated with H+ ions before the sample run.
A#8:Ions are displaced from the resin binding sites by any ion that has higher binding affinity.
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