Therefore, sodium carbonate and potassium carbonate are thermally stable. They do not decompose when heated.
Sodium and potassium are both very reactive metals, so the carbonates of both metals are very stable and require high temperature to decompose into their respective metal oxides and carbon dioxide.
The potassium carbonate formed remains completely stable at temperatures below 1123 K (850 °C); it starts to melt at about 1172 K (899 °C) and decomposes to K2O.
at higher temperature
Sodium carbonate and potassium carbonate are stable and will not decompose with heat.
Heating this solid above 200°C (392°F) gives the anhydrous salt. In an alternative method, potassium chloride is treated with carbon dioxide in the presence of an organic amine to give potassium bicarbonate, which is then calcined: 2 KHCO3 → K2CO 3 + H2O + CO.
Answer: A carbonate that does not decompose when heated: sodium carbonate and potassium carbonate. A nitrate that is the only gas that produces oxygen: sodium nitrate and potassium nitrate. A compound that produces carbon dioxide when heated: calcium carbonate.
The correct option is D
(a) A carbonate that does not decompose when heated. (b) A nitrate that produces oxygen as the only gas.
Answer and Explanation: We need to write the balanced reaction for the decomposition of potassium carbonate to potassium oxide and carbon dioxide.
Anhydrous sodium carbonate is heat stable and does not decompose even when heated to the point of reddening. This is because sodium carbonate salt reacts with acids when heated, releasing carbon dioxide.
It is a carbonate salt and a potassium salt. Potassium carbonate (K2CO3) is a white salt, soluble in water (insoluble in ethanol) that forms a strongly alkaline solution. It can be produced as a product of the absorption reaction of potassium hydroxide with carbon dioxide. It has a large capacity to absorb moisture.
Barium carbonate decomposes most easily.
Lithium carbonate (Li2CO3) is less stable compared to sodium carbonate (Na2CO3). Sodium carbonate is very heat resistant. Therefore, it decomposes at high temperatures. Lithium carbonate is not heat stable.
The decomposition of the bicarbonate occurs between 100 and 120 °C (212 and 248 °F): 2 KHCO3 → K2CO3 + CO2 + H2O.
When potassium chlorate (KClO3) is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas.