Flame tests results...
Big Goats Can Break Pots Like Little Rebecca Sold Yesturday
Test for Carbonates
Any carbonate will produce carbon dioxide gas when you add a dilute acid.
For example, adding hydrochloric acid to sodium carbonate solution
HCl + sodium carbonate sodium chloride + carbon dioxide + water.
2HCl(aq) + Na2CO3(aq) 2NaCl(aq) + CO2(g) + H2O(l)
Some carbonates change colour during thermal decomposition.
copper carbonate copper oxide + carbon dioxide
CuCO3(s) CuO(s) + CO2(g)
Copper carbonate is green and becomes copper oxide which is black.
zinc carbonate zinc oxide + carbon dioxide
ZnCO3(s) ZnO(s) + CO2(g)
Zinc carbonate is white and becomes yellow zinc oxide.
Zinc oxide is yellow when it is hot