In this experiment you will determine the relative atomic mass, $$\(A_{r}\)$$, of metal $$\(\mathbf{M}\)$$ by thermal decomposition of the same basic metal carbonate, $$\(\mathrm{MCO}_{3} \cdot \mathbf{M}(\mathrm{OH})_{2}, \mathrm{FB} 1\)$$. Method - Weigh the empty crucible with its lid. Record the mass in the results section. - Transfer all of the FB 1 from the container into the crucible. - Weigh the crucible, lid and FB 1. Record the mass. - Calculate the mass of FB 1 used. Record this mass in the space for other results. - Place the crucible and contents on a pipe-clay triangle. - Heat the crucible gently, with the lid on, for approximately 1 minute. - Heat strongly, with the lid off, for a further 5 minutes. - Replace the lid and leave the crucible to cool for at least 5 minutes. During the cooling period, you may wish to begin work on Question 3. - When the crucible is cool, weigh the crucible with its lid and contents. Record the mass. - Place the crucible and contents on the pipe-clay triangle. Remove the lid. - Heat strongly for a further 2 minutes. - Replace the lid and leave the crucible to cool for at least 5 minutes. - When the crucible is cool, reweigh the crucible with its lid and contents. Record the mass. - Calculate the mass of residue obtained. Record this mass in the space for other results. Results mass of empty crucible and lid $$\(=\)$$ ...................... mass of crucible, lid and FB 1 (before heating) = ...................... mass of crucible, lid and FB 1 (after first heating) = ...................... mass of crucible, lid and FB 1 (after second heating) = ...................... Other results

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