To identify these chemicals I will carry out two types of test: Flame test and chemical test.
Problem: you are provided with 3 unknown chemicals which are labelled A, B, C, D and E. Carry out appropriate test to identify the chemicals. Method: to identify these chemicals I will carry out two types of test: Flame test and chemical test. Flame test: * To carry out the flame test I will dip the metal wire in the roaring Bunsen flame. * Then I dipped the wire in hydrochloric acid * Next I placed it into the sample and then I placed it into the roaring Bunsen Flame * After I recorded the colour of the flame Safety: * I wore goggles to protect my eyes from acid (hydrochloric acid is corrosive) * When I was not using the Bunsen burner, I put it on safety flame * I also used small amounts of acid and have a safety mat Test for cat ion: Chemical Flame colour Cat ion A Yellow Na+ B Lilac K+ C Green Cu2+ Test for an ion: Substance Test observation Sodium chloride Add Dilute hydrochloric acid It fizzes and carbon dioxide gas is produced Copper carbonate Add Acidified silver nitrate White precipitate Potassium sulphate I added Acidified barium chloride solution White precipitate Evaluation: Flame test and chemical test tell us which chemicals are present. This is called a qualitative analysis. In industry, it is also very important to know how much of the chemical is present. The difference between my tests and the tests carried out in
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