
Concept explainers
Interpretation:
The balanced net ionic equation has to be written for all the reactions for the given situation.
Concept introduction:
While writing the net ionic equation, an understanding of spectator ions is very important. The spectator ions are the ions which are found in same form in both the reactant and product sides. So, while writing the net ionic equation, these ions are not involved or simply not counted.

Answer to Problem 45QAP
The net ionic equations are:
Explanation of Solution
Given Information:
- (1) A solution of potassium dichromate is made basic with sodium hydroxide. The color changes from red to yellow.
(2) The addition of silver nitrate to the yellow solution gives the precipitate.
(3) The precipitate dissolves in concentrated ammonia.
(4) The dissolved precipitate again reforms when nitric acid is added.
From the given details, we can infer that four independent reactions will take place. The balanced net ionic equation will be written for each step of procedure separately.
Step1: A solution of potassium dichromate is made basic with sodium hydroxide.
The color changes from red to yellow.
The ionic reaction form will be:
Step 2: The solution is added with AgNO3 :
The spectator ions
Net ionic equation is:
Step3: The precipitate is dissolved in concentrated ammonia.
The reaction is automatically in its net ionic form.
Step 4: The dissolved precipitate again reforms when nitric acid is added.
Here, the spectator ion is
The net ionic equations are:
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Chapter 20 Solutions
Chemistry: Principles and Reactions
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