Chem question

a) the conclusion cannot be sure,since both carbonates and chlorides give white precipitate when acidified silver nitrate solution is added.

b) The conclusion cannot be sure, since the content of bubbles given out is unsured.

c) For a), add dilute nitric acid before adding acidified silver nitrate to dissolve the carbonates. For b), test the bubbles with lime water to ensure whether it is carbon dioxide.

d) The conclusion cannot be sure, since there may be a very amount of other ions that cannot be tested by the following tests.