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Qualitative AnalysisCalcium chlorideLead nitrateCopper sulphatePotassium sulphateIron chlorideSodium carbonate

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Introduction

Qualitative Analysis In qualitative analysis you test for the substances present but do not attempt to find out the amounts. The first step is to obtain pure samples of the substances to be tested. This involves the separation of the components on mixtures by a physical method. There are quite a few methods: * Evaporation or distillation may be used to remove unwanted liquids from solids or to obtain a pure liquid from one that is contaminated by dissolved solids. * Fractional distillation may be used to separate pure liquids from mixtures * Chromatography may be used to obtain pure solids from solutions containing a number of dissolved solids. There are a number of tests that are carried out on pure substances: * Initial observations * Flame tests * Tests on solutions for presence of ions: Positively charged ions are identified by reacting solutions with alkaline solutions. ...read more.

Middle

Put baggage etc well under benches, away from the working area. Inform staff and seek medical attention. Help the person if possible. 1. Nitric acid 2. Sodium hydroxide Corrosive - it could burn the skin. Can be dangerous if it gets in your eyes. Low risk if low concentration is used. Wear safety glasses at all times that the practical is going on. Wear a lab coat to protect you and your clothes. Stand up when doing practical work. Clean up any spillages straight away. In case of contact with skin, wash immediately with plenty of cold water. In case of contact with eyes, rinse immediately for 15 minutes with plenty of cold water and seek medical advice. Silver nitrate Stains. It will stain anything and everything. Low risk if used safely and sensibly Wear safety glasses at all times that the practical is going on. ...read more.

Conclusion

5. If a white solid is formed when barium chloride solution is added then the ions contained in the solution are SO42- ions 6. If a white solid is formed when silver nitrate solution is added then it is Cl- ions Method for testing positively charged ions 1. Results Table Solution Positive ions Negative ions Name of the solution A Pb2+ Not found One of the solutions was lead nitrate B Cu2+ SO42- Copper sulphate C Ca2+ Cl- Calcium chloride D Na+ or K+ CO32- Either sodium carbonate or potassium carbonate. Needs a flame test to find out. E Fe3+ Cl- Iron chloride F Na+ or K+ SO42- Either Sodium sulphate or potassium sulphate. Needs a flame test to find out. For solution D and solution F I had to do a flame test. Solution D went yellow so therefore it indicates that it is sodium carbonate. Solution F went lilac therefore it indicates that it is potassium sulphate. ?? ?? ?? ?? ...read more.

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