107 Exp 3 Lecture

107 Exp 3 Lecture - SeparationofCa2+,Ba2+,NH4+,K+...

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Experiment 3 Separation of Ca2+, Ba2+, NH4+, K+ Looking Ahead n Experiment 2 make-up n Due to 5 PM in two days after the class n Next weak  – Exp4 n Pre-quiz for Exp4 n Due to 1 hour before the class  n Make-up for exp2 n #3 = Single Unknown n #4 = Multiple Unknown
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Hazards n Waste must go into  waste container n Conserve Chemicals n 12 M HCl is a strong  Acid and will harm you n Stored in the hood
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Click here to print walkthrough Start from Step C Don’t put pH paper  in the test tube 3 drops Until ppt stops Until ppt dissolves Same amount as  1 2 drops Add more  until ppt stops 1 or 2 drops Until it dissovles 10 drops 4 drops Until  basic supernatant ppt Until it dissolves If ppt occurs, No Calcium clean wire first
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Follow this rule n Separate unknown to 2 test tubes n First : for Ammonium (NH4+) test  (Step A or  Step D.4)     - Add NaOH and put a wet pH paper onto the test tube
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107 Exp 3 Lecture - SeparationofCa2+,Ba2+,NH4+,K+...

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