A chemist performs the following sequence on an aqueous copper(II) chloride solution…
CHEMISTRY · Multi-part · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
A chemist performs the following sequence on an aqueous copper(II) chloride solution at 25 °C:
Stage 1: Sodium hydroxide solution is added dropwise until a pale blue precipitate forms and no further visible change is observed.
Stage 2: Without removing any solid, excess concentrated ammonia solution is added, producing a deep-blue homogeneous solution.
Complete the tasks that follow.
(a) Write the balanced net ionic equation for the reaction that occurs during Stage 1.
(b) Write the balanced net ionic equation for the reaction that occurs during Stage 2.
(c) Considering the initial solution and the two stages, compile a comprehensive list of all ionic species that remain in the aqueous phase after Stage 2 is complete.
(d) Identify every ion that acted solely as a spectator throughout both stages. Provide clear justification by referencing the equations you wrote in parts (a) and (b).