Give reason for, `'NaHCO_(3)` is known in solid state but `Ca(HCO_(3))_(2)` is not isolated in solid state.

Explanation

The sodium bicarbonate `(NaHCO_(3))` is highly stable to heat. As the electropositive character increases, the stability also increases. So `NaHCO_(3)` is known to exist as solid whereas `Ca(HCO_(3))_(2)` is soluble in water. All the carbonates of alkali metals are more soluble in the atmosphere of `CO_(2)` and form bicarbonates. Therefore, they cannot be isolated in the solid state.