You are provided with a metal carbonate labelled D and a solution N, which contains 1.46 g of hydrochloric acid per 0.2 dm³ of solution. The hydrochloric acid is a strong monovalent acid. You will perform titration using solution N, which contains 1.46 g of hydrochloric acid per 0.2 dm³ of solution. Additionally, you are to analyse the carbonate content, you will perform your experiment involving dissolving 3.45 g of the metal carbonate in distilled water to make 250 cm³ solution. Follow the procedure below with a limted amount of dropper and measuring cylinder to proceed with the titration. Record your observation and calculations. Procedure (i) Place 25 cm³ of solution D into a conical flask and add 2 to 3 drops of methyl orange indicator. (ii) Fill the burette with solution N. (iii) Titrate the conical flask contents with N until colour change. (iv) Repeat procedure (ii) and (iii) three more times and record your results in tabular form. Questions (a) What is the colour change of the reaction? (b) What volume of the acid required for complete reaction with the carbonate? (c) Identify the type of reaction in this experiment. (d) Write a balanced chemical equation for the reaction between D and N. (e) Calculate; (i) the molarity of N. (ii) the molarity of D. (iii) the molecular weight of the carbonate. (iv) the atomic mass of the monovalent metal in the carbonate. (f) Write the ionic symbol for the metal in D.

1. What is the colour change of the reaction? (1 mk)
2. What volume of the acid required for complete reaction with the carbonate? (2 mk)
3. Identify the type of reaction in this experiment. (1 mk)
4. Write a balanced chemical equation for the reaction between D and N. (3 mk)
5. (16 mk)
6. Write the ionic symbol for the metal in D. (2 mk)
7. the molarity of N. (4 mk)
8. Suggest another indicator that could be used for this titration and justify your choice. (3 mk)
9. the molarity of D. (5 mk)
10. the molecular weight of the carbonate. (3 mk)
11. the atomic mass of the monovalent metal in the carbonate. (3 mk)

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A cat has been found dead after consuming a certain solid chemical from opened bottle in the laboratory. It is unfortunate that the bottle label was also destroyed by rats and the investigator decided to name the solid residues as sample T. Carry out qualitative analysis experiments to identify the ions present in the sample which killed the cat based on the following tests: (i) Appearance of the sample T. (ii) Action of heat on the sample T. (iii) Solubility of the sample T. (iv) Action of dilute hydrochloric acid on the solid sample T. (v) Action of concentrated sulphuric acid on the solid sample 'T. (vi) Action of aqueous sodium hydroxide on the solution sample T. (vii) Action of barium chloride on the solution sample T. (viii) Do confirmatory test for the cation and anion. Questions (a) Prepare a table showing the qualitative analysis results. (b) Identify the cation and the anion in the solid. (c) Write the chemical formula of the solid. (d) Write a balanced chemical equation for the reaction in experiment (ii). (e) Write two uses of sample T in daily life.

1. Appearance of the sample T. (1 mk)
2. Prepare a table showing the qualitative analysis results. (10 mk)
3. Identify the cation and the anion in the solid. (4 mk)
4. Action of heat on the sample T. (3 mk)
5. Solubility of the sample T. (2 mk)
6. Write the chemical formula of the solid. (3 mk)
7. Write a balanced chemical equation for the reaction in experiment (ii). (5 mk)
8. Action of dilute hydrochloric acid on the solid sample T. (3 mk)
9. Write two uses of sample T in daily life. (3 mk)
10. Action of concentrated sulphuric acid on the solid sample 'T. (3 mk)
11. Action of aqueous sodium hydroxide on the solution sample T. (3 mk)
12. Action of barium chloride on the solution sample T. (3 mk)
13. Do confirmatory test for the cation and anion. (7 mk)

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