A solution of concentrated aqueous ammonia is added dropwise to 1mL of a dilute aqueous solution of copper (II) nitrate until a total of 1mL of the ammonia solution has been added. What observations can be made during this process?

Options

A. The colourless copper (II) nitrate solution turns blue and yields a dark blue precipitate
B. The colourless copper (II) nitrate solution yields a white precipitate which turns dark blue upon syanding.
C. The light blue copper (II) nitrate solution yields a precipitate which redissolves to form a dark blue solution.
D. The light blue copper (II) nitrate solution turns dark blue and yields a dark blue precipitate.

Answer

C

Explanation

Initially `Cu(OH)_(2)` is formed which dissolves to form `[Cu(NH_(3))_(4)]^(2+)`