A certain solution labeled B whose components have a formula unit of M2CO3 was prepared by dissolving 2.65 g of M2CO3 to make 0.5 dm3 solution. In order to identify the unknown element M in the formula, an experiment is required to be performed using 0.10 M HCl which is kept in the beaker labelled G. Methyl orange indicator is also available. Then, follow the following procedure to identify element M. Procedure: (i) Pipette 20 cm3 or 25 cm3 of B and transfer it into a titrating flask. Add three drops of methyl orange indicator. (ii) Transfer solution G into the burette. (iii) Titrate solution G against B until end point is reached. (iv) Repeat procedures (i) to (iii) three more times. (a) (i) What is the volume of the pipette used? (ii) Present your results in an appropriate table of results. (b) Calculate the average titre volume. (c) Write a balanced chemical equation for the reaction between solutions labelled B and G and the corresponding ionic equation. Include the state symbols in both equations. (d) Calculate the concentration of B in (i) g dm-3. (ii) mol dm-3 (e) Calculate the molar mass of M2CO3 and identify element M. (f) If element M is reacted with water, (i) Write a balanced chemical equation that shows the reaction. (ii) Give the colour of the solution when few drops of POP are added to the solution.

1. (ii) Present your results in an appropriate table of results. (0 mk)
2. Calculate the average titre volume. (0 mk)
3. Write a balanced chemical equation for the reaction between solutions labelled B and G and the corresponding ionic equation. Include the state symbols in both equations. (0 mk)
4. (ii) mol dm-3 (0 mk)
5. Calculate the molar mass of M2CO3 and identify element M. (0 mk)
6. (ii) Give the colour of the solution when few drops of POP are added to the solution. (0 mk)

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