The 4 numbered tubes contain the following substances: potassium chloride

| May 21, 2021 | education

The 4 numbered tubes contain the following substances: potassium chloride, calcium carbonate, potassium carbonate, and calcium chloride. determine which tube each salt is in.

KCl + AgNO3-> KNO3 + AgCl (white flocculent precipitate)
CaCO3-> CaO + CO2 (when heated, decomposes with the formation of a crystalline precipitate of calcium oxide and bubbles of carbon dioxide)
K2CO3 + 2HCL-> 2KCl + H2O + CO2 (as a result of the substitution reaction, we get unstable carbonic acid H2CO3, which practically immediately decomposes into water and carbon dioxide.
CaCl2 can probably be detected either by elimination or in 2 steps.
1) CaCl2 + AgNO3-> Ca (NO3) 2 + AgCl (white flocculent precipitate)
2) 2Ca (NO3) 2 = 2CaO + 4NO2 + O2 (oxygen bubbles are released, which supports the burning of the glowing rolling pin)



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