Question

How do you represent the loss of carbon dioxide from soda lime, `Na_2CO_3`?

Answer 1

I think you mean the loss, the decarboxylation, of `CO_2` from `Na_2CO_3`.

Explanation:

But, `Na_2CO_3` is NOT `"SODA LIME"`. Soda lime is the product, `Na_2O` and its hydroxides, and it is obtained from `"decarboxylation"` of sodium carbonate:

`Na_2CO_3(s) + Delta rarr Na_2O(s) + CO_2(g)uarr`