The thermal stabilities of some of the trioxocarbonate(IV)s of metals like lithium, sodium and copper can be assessed by performing simple experiments in laboratories.
The experiment requires, three test tubes, gas holder, lime water.
Take the three test tubes and to each of it add about I g each of LiFO3, Na2CO3 and CuCO3. To the mouth of the test tubes attach gas detector containing lime water. The simple experimental set up is shown below:
The trioxocarbonate(IV)s of lithium and copper will decompose on heating and will turn lime water milky.
The trioxocarbonate of copper decomposes at much slower rate than that of lithium. Na2CO3 will not decompose to produce carbon dioxide gas.