$5\mathrm{.}3$ Below is the TGA figure extract with traces in air for the following hydrated fillers:

Hvdromaanesite $(M{g}_5(C{O}_3)4(OH{)}_2*4H_{2}O),$ Hydrotalcite $(Mg6Al2C{O}_3(OH{)}_{16}*4(H_{2}O)$ and Magnesium hydroxide $(MgO{H}_2).$ The temperature was scanned from $25C$ to $900C$ at a scan rate of $10Cmi{n}^{-1}$ with air flowing at a rate of $50mLmi{n}^{-1}.$ The residual masses at the $900C$ obtained were $67\mathrm{.}3wt.\%,56\mathrm{.}8wt.\%$ and $43\mathrm{.}1wt.\%$ for $Mg(OH{)}_2,$ hydrotalcite and hydromagnesite respectively.

The corresponding theoretically expected values are $69\mathrm{.}1wt.\%,56\mathrm{.}1$ wt$.\%$ and $43\mathrm{.}1wt.\%$ for $Mg(OH),$ hydrotalcite and hydromagnesite respectively.

$(9)$

Show by drawing a scheme, all the endothermic decomposition of hydrotalcite $($LDH$)$ that are occurring over the temperature range $200C$ to $550C.$

NB$!!!$ Show temperatures at which each decomposition occurs.