Basic copper carbonate can be regarded as composed of copper hydroxide and copper carbonate. It is insoluble in water. Generally, regardless of its acidity and alkalinity, it can react with acids to form copper salts, which can react with alkaline substances. The law of acid reaction is the same. It is alkaline and can produce brown copper oxide when boiled in water or heated in a strong alkaline solution. This is inconsistent with the formation of salts between acidic substances and alkaline substances. It is not an acidic substance.