The tests carried out on P are listed in Table 3.1. Test 1: flame test, observation: orange-red flame. Test 2: add aqueous ammonia. Describe how the student carries out a flame test.
Describe one observation expected in test 2 using the observation in test 1 as a guide.
Describe one further test to confirm the identity of the cation in P. Include the result of a positive test.
Identify the cation in P.
Solution Q is acidic. The tests carried out on Q are listed in Table 3.2. Test 3: add five drops of universal indicator, observation: colour change. Test 4: add a piece of magnesium ribbon, observation: magnesium ribbon disappears. Test 5: add dilute nitric acid followed by aqueous barium nitrate, observation: white precipitate. Describe the expected colour change in test 3.
A gas is produced in test 4. Predict one other observation the student would make in test 4.
Predict the identity of the gas produced in test 4.
Describe a test to confirm the identity of this gas. Include the result of a positive test.
Q contains one cation and one anion. Identify the cation and the anion in Q.