How do I understand the characteristics
How do I understand the characteristics of simple ions through qualitative analysis?
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I’d also like to know the tests that will help in identifying hydrogen and chlorine ions by using electrolysis, and an experiment which will help determine enthalpy changes when copper sulfate and zinc are used together. What are the results that I can expect from this experiment?
Qualitative analysis deals with the determination of elemental composition of inorganic salts. Solutions of different types of unknown samples are made in this process and they are then tested with various reagents in order to determine the ions that are present in the solution. The ions undergo some characteristic reactions when they react with these reagents which may result in a color change or any other visible change or formation of some different compounds. There are a number of methods for characterizing ions through cation or anion analysis like ash test, flame test, potassium chromate test, etc.
If sodium chloride is used as the electrolyte during an electrolysis process, then hydrogen and chlorine can easily be identified as hydrogen gas will be collected over the cathode and chlorine gas will be collected over the anode.
When copper sulphate is added to zinc, a displacement reaction takes place which makes a change in its enthalpy. There is a difference in the heat content of the reactants and the products and the temperature of the solution may rise due to that. So, it is expected that the overall enthalpy of the solution will be negative, resulting in an exothermic reaction as heat is given out.