Question

2. The following observations were made in the laboratory:

a) A copper chloride solution is blue
b) A sodium chloride solution is colorless.
c) A calcium chloride solution is colorless.
d) A calcium nitrate solution is colorless.
e) A sodium nitrate solution is colorless.
f) A copper nitrate solution is blue.

Answer 1

The color of solutions can indicate the presence of certain ions. Copper chloride and copper nitrate solutions are blue, while the rest are colorless. The presence of a blue precipitate in the reaction between a salt solution and silver nitrate indicates the presence of chloride ions.

Step-by-step explanation:

Based on the observations made, we can determine that copper chloride and copper nitrate solutions are blue, while sodium chloride, calcium chloride, calcium nitrate, and sodium nitrate solutions are colorless.

The presence of a blue precipitate when silver nitrate solution is added to a clear, colorless salt solution indicates the presence of chloride ions. The balanced equation for the reaction between the salt and silver nitrate is:

AgNO3 + NaCl → AgCl + NaNO3