1. What class of reaction occurs when you add Na2HPO4 to a mixture of Fe(NO3)3 a
ID: 535016 • Letter: 1
Question
1. What class of reaction occurs when you add Na2HPO4 to a mixture of Fe(NO3)3 and NH4SCN? What is the net ionic equation of the chemical reaction that causes the equilibrium shift as well?
2. What class of reaction occurs when you add NH3 to a mixture of Fe(NO3)3 and NH4SCN? What is the net ionic equation of the chemical reaction that causes the equilibrium shift as well?
For each addition briefly describes what you observe (color changes, formation of ppt, etc), what class of reaction is occurring to cause the shift (acid-base, redox, complexation, precipitation). and the chemical reaction that has caused the shift in equilibrium. Each shift in equilibrium is caused by a reaction with one of the reactants or products in equation 1. Based on your observations and using resources in your text book, such as the table of solubility rules and table of reduction potentials, write the net ionic equation that describes the chemistry occurring that causes the shift in equilibrium. 0.10M SnCl_ 2(aq) Observation: ___________ Class of Reaction: _________ Chemical Reaction: ___________ 0.1M AgNO_ 3(aq) Observation: __________ Class of Reaction: ____________ Chemical Reaction: __________ 1M Na_2HPO_4(aq) Observation: __________ Class of Reaction: ____________ Chemical Reaction: __________ 1M NH_ 3(aq) Observation: __________ Class of Reaction: ___________Explanation / Answer
1. When Na2HPO4 was added to Fe(NO3)3 and NH4SCN, displacement reaction occurs
net ionic equation,
2Fe3+ + 3HPO4- ---> Fe2(HPO4)3
2. When NH3 is added to Fe(NO3)3 and NH4SCN, hydrolysis occurs
net ionic equation,
Fe3+ + 3OH- ---> Fe(OH)3
red color precipitate forms
3. When 0.1 M SnCl2 is added to Fe(NO3)3 and NH4SCN, complexation occurs
net ionic equation,
Fe3+ + SCN- ---> Fe(SCN)2+
deep red precipitate forms
4. 0.1 M AgNO3 added, displacement occurs
Colorless precipitate formed
Ag+ + SCN- --> AgSCN
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