怎样分辨碳酸钙同埋碳酸氢钙? 碳酸钙 分子式 caco3 分子量 100.1 amu 外观 白色固体 cas号 471-34-1 物理性质 stp下的密度 2.7×103 kg/m3 ( ) 溶解度 0,0013g/100g的水 ph (10% 水溶液) 酸度常数 分解温度 1172 k (889 ℃) 相态 熔点 1612 k (1339 ℃) 沸点 1172 k (889 ℃) 安全性 摄取 危险性低，长期摄取有危害 吸入 危险性低 皮肤 危险性低 眼睛 危险性低 固体性质 标 生成焓 (δfh0固) -1207 kj/mol 标 熵 (s0固) 93 j/mol k 液体性质 δfh0液 -1154 kj/mol 碳酸钙是一种化合物，化学式是caco3。它是地球上常见物质，可于岩石内找到。动物背壳和蜗牛壳的主要成份。 碳酸氢钙 calcium bicarbonate calcium bicarbonate (ca(hco3)2), also called calcium hydrogencarbonate, is a compound which exists only in solution. if a solution evaporates, the following reaction occurs: ca(hco3)2(aq) → co2(g) + h2o(l) + caco3(s). calcium bicarbonate is formed when water containing carbon dioxide in solution (also known as carbonic acid) reacts with calcium carbonate. this reaction is very important to the formation of stalactites, stalagmites, columns, and other speleothems within caves and, for that matter, in the formation of the caves themselves. water containing atmospheric carbon dioxide passes through limestone, or other calcium carbonate containing minerals, converting part of the calcium carbonate to the bicarbonate, which is very water soluble. later, in drier conditions, or upon a rise in temperature, the excess carbon dioxide is released from the solution of the bicarbonate, causing the much less soluble calcium carbonate to be deposited. the reaction is very temperature sensitive, with a rise in temperature easily driving carbon dioxide out of the calcium bicarbonate solution. 查看更多
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