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la question elle est pas très claire je pense qu'il s'agit de carbone avec quatre laisons
Start Melting beacause the melting point is 153 c At 175 c start decompese
Citric acid starts decomposing with the lose of carbondioxide which causes effervences. Water molecule is also lost during the process.
Decomposes by loss of CO2 and H2O.
It will from the anhydride of the acid loosing a molecule of water
It start to melt as its melting point is 156°C .and by continuing heating till 175 it starts to dehydrate
Citric acid Melting point 156 °C (313 °F; 429 K) Boiling point 310 °C (590 °F; 583 K) decomposes from 175 °C[1]
Since the melting point of citric acid is C so by heating it atO C, it starts to melt. But by heating the Citric acid above C it decomposes producing carbon dioxide and w ... Voir Plus