please help this is all we did for C. Effect of adding a strong acid base to an
ID: 500443 • Letter: P
Question
please help
this is all we did for
C. Effect of adding a strong acid base to an amphoteric hydroxide
1. Obtain approximately 20.0 mL of 1.0 M zinc nitrate solution and place it into a 150 mL beaker.
2. Add 6 M sodium hydroxide (with mixing), in a drop-wise fashion, until a reasonable amount of solid appears.
3. Divide the mixture from step 2 into approximately two equal portions. (This mixture contains the amphoteric hydroxide.)
4. To one of the two portions, continue to add 6 M sodium hydroxide (with mixing) until you see a distinct change in the mixture. Note how much sodium hydroxide solution was added. (Recall: 20 drops 1 mL)
5. To the other portion, add 6 M nitric acid (with mixing) until you see a distinct change in the mixture. Note how much nitric acid solution was added. Dispose of the solutions in the appropriate waste receptacle.
3. Write the net ionic equation for the reaction that initially occurs when aqueous sodium hydroxide is added to the zinc nitrate solution. (Formation of the amphoteric hydroxide.)
Write the net ionic equation for the reaction that occurs when an excess of sodium hydroxide is added to the amphoteric hydroxide. (Step 4) Write the net ionic equation for the reaction that occurs when nitric acid is added to the amphoteric hydroxide. (Step 5)
In the context of part C of this experiment, explain what an amphoteric hydroxide can do that:
• acetic acid can’t do
• aqueous ammonia can’t do
• sodium chloride can’t do
Explanation / Answer
SOLUTION:
1. Net ionic reaction of step 2.
Zn(NO3)2(aq) + 2NaOH (aq) --------> Zn(OH)2(s) + 2NaNO3(aq)
Zn2+ (aq) + 2NO3- (aq) + 2Na+(aq) + 2OH-(aq) -------> Zn(OH)2(s) + 2Na+(aq) + NO3-(aq)
NET IONIC REACTION: Zn2+ (aq) + 2OH-(aq) -------> Zn(OH)2(s)
2. Net ionic reaction of step 4.
Zn(OH)2(s) + 2NaOH (aq) --------> Zn(OH)42- (aq) + 2NaOH(aq)
Zn(OH)2(s) + 2Na+ (aq) + 2OH- (aq) --------> Zn(OH)42- (aq) + 2Na+ (aq)
NET IONIC EQUATION:
Zn(OH)2(s) + 2OH- (aq) --------> Zn(OH)42- (aq)
Q3.
Zn(OH)2(s) + 2HNO3(aq) --------> Zn(NO3)2(aq) + 2H2O(l)
Zn(OH)2(s) + 2H+(aq) + 2NO3-(aq) --------> Zn2+(aq) 2(NO3)-(aq) + 2H2O(l)
NET IONIC REACTION:
Zn(OH)2(s) + 2H+(aq) --------> Zn2+(aq) + 2H2O(l)
Dear candidate we dont find part (C) in the question. Hence the last four parts ca not be solved.
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