We have soluble and Insoluble trioxocarbonates (iv).
Soluble Trioxocarbonates is formed by bubbling CO2 into alkalis.
CO2(g) + 2NaOH(aq) → 2Na2CO3(aq) + H2O(L)
Insoluble Trioxocarbonates are prepared by double decomposition.
CaCL2(aq) + Na2 CO3(aq) → 2NaCL(aq) + CAO3(s)
Properties of Trioxocarbonates
1) All trioxocarbonates, decompose on heating to release CO2 except sodium, barium and potassium trixocarbonates.
2) All trioxocarbonates are insoluble in water except sodium, potassium and ammonium trixocarbonates,
3) All trioxocarbonates react with dilute acids to form salt, H2O and CO2.
Test For triocxocarbonates
When warmed with dilute acids they liberate CO2 (which turns lime water into milky).
Hydrogen Triococarbonates
They are prepared by dissolving excess CO2 in alkalis.
NB: All hydrogen trioxocarbonates (iv) decompose to form the corresponding trioxocarbonates (iv) H2O and CO2