hydrogencarbonate是否carbonic acid？還有，calcium chloride是甚麼顏色？急~

carbonic acid是H2CO3，和hydrogencarbonate(HCO3^-)不同

calcium chloride是白色和solid state in standard condition(25度，1個大氣壓力).

1.hydrogencarbonate ge chemical formula 係 HCO3^- but carbonic acid ge chemical formula 係 H2CO3.Thus,they are not the same.
2.Calcium ions (Ca^2+)係 colourless ge.而chloride ions( Cl^-)都係colourless ge.The state of calcium chloride is solid.
If you want to prove that it is calcium chloride,you can use flame test to test for calcium and silver nitrate test to test for chloride.If flame test show the brick -red colour,the compound must contains calcium ions (Ca^2+). In silver nitrate test ,a white ppt shows the compound contains chloride ions( Cl^-).