Experiment 5.html - ChemWeb Verify Your Work Experiment 5 1...

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ChemWeb Verify Your Work Experiment 5 1. Are any specific safety alerts given in the experiment? List any that are given.
2. Are any specific disposal directions given in the experiment? List any that are given.
3. Describe how to maintain a supply of clean droppers available for use in the experiment.
4. How many spotting capillaries do you prepare for use in Part A?
5. What size sample spots should be put on the chromatography paper in Part A?
6. Describe how you make the spots on your chromatogram visible in Part A. insert the paper into a beaker with acetone, nitric acid, and hydrochloric acid. 7. What do you do with the chromatogram in Part A after it has been developed and the distances measured?
8. What are the approximate sizes of the samples of mixtures you obtain for separation in Parts B and C?
9. When can you stop heating the sample you are to separate in Part B?
10. What is the name of the technique used to separate the substances that have different solubilities in water?
distillation Table 5.1 (data) sample Distance Fe 3+ 5.5cm Co 2+ 0.5cm Cu 2+ 2.8cm Mixture 0.7cm 2.8cm 5.6cm Unknown 2.7cm 2.7cm 2.7cm Mobile Phase No Answer Given Table 5.2 (report) sample R f Fe 3+ 0.92cm Co 2+ 0.08cm Cu 2+ 0.47cm Mixture 0.12cm 0.47cm 0.12cm Unknown 0.45cm 0.45cm 0.45cm ID number of unknown 1782
Identity of ions in unknown Fe3+, Co2+, Cu2+ Table 5.3 (data) Sample Tested Behavior when HCl was added Solid CaCO 3 fizzy and cloudy Solid NH 4 Cl no reaction Mixture fizzy Collected solid no reaction Table 5.4 (report) Identity of collected solid that sublimed NH4Cl Explanation because there was no reaction or change when HCl was added to the collected sample Table 5.5 (data) Observations Sample Tested Add HCl Add NH 3 Solid CaCO 3 evolution of gas/cloudy nothing Solid CuSO 4 color is green/stagnant darker colour blue Mixture evolution of gas darker colour blue Filtrate darker colour blue

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