1. Initial solutions: a) What ions are present in the KSCN(aq) solution? b) What ions are present in the Fe(NO:)s(aq) solution? e) What is the net ionic equation for the reaction between KSCN(aq) and Fe(NO:)e(aq)?
1. Initial solutions: a) What ions are present in the KSCN(aq) solution? b) What ions are present in the Fe(NO:)s(aq) solution? e) What is the net ionic equation for the reaction between KSCN(aq) and Fe(NO:)e(aq)?
Chapter26: Molecular Absorption Spectrometry
Section: Chapter Questions
Problem 26.30QAP
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This is the lab with my data sheet and please answer all of them. Thank you
My data to support answers for questions.
The equilibrium is Fe3+ + SCN- <--> [FeSCN]2+. The Fe3+ is a pale yellow colour and the complex ion product is red.
Stresses:
Add KSCN - turned deep red
Add Fe(NO3)3 - turned deep red
Add Na2CO3 - turned yellow/colourless
Add NaOH - turned yellow/colourless
Add NH3 - turned yellow/colourless
Heat - turned lighter orange colour
Cold - turned darker orange colour
![1. Initial solutions:
a) What ions are present in the KSCN(aq) solution?
b) What ions are present in the Fe(NO:):(aq) solution?
e) What is the net ionic equation for the reaction between KSCN(aq) and Fe(NO:):(aq)?
d) What species is responsible for the observed colour change when KSCN(aq) and Fe(NO:)a(aq) are
mixed?
e) What can be concluded about the system based on your -1l minute observation of the mixture?
Addition of KSCN(s) to test tube 2:
a) What does the addition of the solid do to the [SCN(aq)]?
b) What can you infer about the system from the colour change of the solution?
c) How can this be possible if no additional Fe*(aq) has been introduced?
Addition of Fe(NO:)a(aq) to test tube #3:
a) What does the addition of the solution do to the [Fe*"(aq)]?
b) What can you infer about the system from the colour change of the solution?
c) How can this be possible if no additional SCN(aq) has been introduceď?
Addition of Na:CO:(s) to test tube #4:
a) As a result of the colour change, what can be concluded about the [FESCN"(aq)]? Explain.
b) Explain why the addition of Na:CO:(aq) affects the [FESCN*(aq)] as indicated in (a). Use a chemical
reaction in your explanation.
Addition of NaOH(aq) test tube #5:
a) As a result of the colour change, what can be concluded about the [FeSCN*“(aq)? Explain.
b) Explain why the addition of NaOH(aq) affects the [FESCN*"(aq)] as indicated in (a). Use a chemical
reaction in your explanation.
Addition of NH-(aq) to test tube #6 and wait 5 minutes:
a) As a result of the colour change, what can be concluded about the [FESCN"(aq)]? Explain.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdff54e34-d9a6-4ecf-a8db-4c6fd8dd4b61%2F532af40e-6ad3-4568-84b0-db89b811dc00%2Fz3jh65r_processed.png&w=3840&q=75)
Transcribed Image Text:1. Initial solutions:
a) What ions are present in the KSCN(aq) solution?
b) What ions are present in the Fe(NO:):(aq) solution?
e) What is the net ionic equation for the reaction between KSCN(aq) and Fe(NO:):(aq)?
d) What species is responsible for the observed colour change when KSCN(aq) and Fe(NO:)a(aq) are
mixed?
e) What can be concluded about the system based on your -1l minute observation of the mixture?
Addition of KSCN(s) to test tube 2:
a) What does the addition of the solid do to the [SCN(aq)]?
b) What can you infer about the system from the colour change of the solution?
c) How can this be possible if no additional Fe*(aq) has been introduced?
Addition of Fe(NO:)a(aq) to test tube #3:
a) What does the addition of the solution do to the [Fe*"(aq)]?
b) What can you infer about the system from the colour change of the solution?
c) How can this be possible if no additional SCN(aq) has been introduceď?
Addition of Na:CO:(s) to test tube #4:
a) As a result of the colour change, what can be concluded about the [FESCN"(aq)]? Explain.
b) Explain why the addition of Na:CO:(aq) affects the [FESCN*(aq)] as indicated in (a). Use a chemical
reaction in your explanation.
Addition of NaOH(aq) test tube #5:
a) As a result of the colour change, what can be concluded about the [FeSCN*“(aq)? Explain.
b) Explain why the addition of NaOH(aq) affects the [FESCN*"(aq)] as indicated in (a). Use a chemical
reaction in your explanation.
Addition of NH-(aq) to test tube #6 and wait 5 minutes:
a) As a result of the colour change, what can be concluded about the [FESCN"(aq)]? Explain.
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