Question 1

A laboratory technician is asked to make a solution of Magnesium Carbonate by dissolving an unknown mass of Magnesium Carbonate powder in 250cm3 of water. 25cm3 of the solution is then titrated against a standard solution of sulphuric acid (0.2 moldm-3).

Figure 1 below shows the initial and final volumes of the burette reading for the volume of acid added.

Figure 1

Use the information given in Figure 1 to complete Table 1.

(i) Average volume of acid used.

(ii) Write a chemical equation for the reaction that occurs during the titration.

(iii) The number of moles of sulphuric acid used in the titration.

(iv) The number of moles of Magnesium Carbonate in 25 cm3 of the solution.

(v) The number of moles of Magnesium Carbonate in 250 cm3 of solution.

(vi) Mass of Magnesium Carbonate dissolved in 250 cm3 of water.

(vii) Describe a laboratory preparation of Anhydrous Magnesium Sulphate. (Include apparatus)

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