Hydrochloric acid potassium carbonate

Answer 1

Because hydrochloric acid is a clear solution and potassium is a solid white powder the observation would be: a colourless, clear solution is add to a solid white powder which formed a solution and produced orderless, colourless gas.

equation: 2H+(aq) +K2CO3(s) ---> 2K+(aq)+ CO2(g)+ H2O(l)

NOTE: observations are what you actually see, therefore you would not be able to tell is the colourless gas was carbon dioxide or that water was present in the solution.

Answer 2

No visible rxn will occur because both HNO3, KCl are soluble.

Answer 3

These two reagents form potassium chloride.