Is the reaction endothetmic or exothermic？Fe3+(aq) + HSCN (aq) ↔ FeSCN2+(aq) + H+ (aq) PLES44Data sheetTable 1CRLSUNJCH)CResyCNSampl Volume ofVolume of Volume ofInitial%T[HSCN]Initial0.200 MFe(NOs)Absorbance at 445R.KSCN(Fe]0.250 M0.00040MHNOnm10.00 ml0. 250(D ano CO.2512H)10.00 ml0.00 ml0.olM20.0bo-00soz000-0s 0.00001 O 250 +0. iu10.00 ml8.00 ml2.00 ml0-OIM 0.00016M 13.9o 8569952310.00 ml6.00 ml4.00 mlD.3500124140. O1M 0.0012M 3.3 |0 6326R.Efe] LHSCN] I fesCN] l IH' ]410.00 ml4.00 ml6.00 ml0. Olm 0.000 SM 37.1 |0.4Au0. 250Table 2kaya l. 259Sample Volume of Volume of Volume of0.0200 M KSCNFe(NO)3Initial0. 250095904Initial%TAbsorbanc0.250 M0,00040M HNO,[Fe][HSCN]e at 445E Fets] [HSCN1 [FesON t2] [H'1nm110.00 ml10,00 ml0.00 ml0-0lM 0 23.0.63640.01000.00a0-350key = 0.87ーズE 0-oloo-0.0006H 0-0002-0.00 o-0000067386|0.35o +D.000673860. a0999332.10,00 ml8.00 ml2.00 ml-J0.OIM 0.000IEM 31.9 0.4962310,00 ml6.00 ml4.00 ml0.00O|2 M44. I O. 355644.10. 35560.000067 3860.25000673860.0IM410,00 ml4.00 ml6.00 mlTHI Fe'3] IHSCNI0-01000.OIM 0.000YM 55.8O. 25 345/(0.000046770.2o10.00 ml4,00 ml6.00 mlIfe SaN 21warm0.000g.0. 250Kay= 0-3505.2- lg(231): 0.63642-ly (s: 0. 49622.0.30499533.0-000153310.0000 467 297.25000 46732- ty (44.1):0.35562-し55.3): 0.25らs4Averge Ka1.65 658 + 1.299 +u.s7+0.55030=1.08402 3tFo+14[fa SCNITH]e sca1AbsCFesaN]+ H* cag.Fe cag + HSCN,a4s Fe ScNO.1000.250C.0.250 +3KSNA HNO 3 ClassS HSCN t KNO34.00X 10* M0-250My=4947.6x +0222.R230.9911.

The reaction is: Fe3+(aq) + HSCN (aq) ↔ FeSCN2+(aq) + H+ (aq)

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Is the reaction endothetmic or exothermic？Fe3+(aq) + HSCN (aq) ↔ FeSCN2+(aq) + H+ (aq)

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter28: Atomic Spectroscopy

Section: Chapter Questions

Problem 28.15QAP

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Question

Is the reaction endothetmic or exothermic？Fe3+(aq) + HSCN (aq) ↔ FeSCN2+(aq) + H+ (aq)

PLES
44
Data sheet
Table 1
CRLSUNJCH)
CResyCN
Sampl Volume of
Volume of Volume of
Initial
%T
[HSCN]
Initial
0.200 M
Fe(NOs)
Absorbanc
e at 445
R.
KSCN
(Fe]
0.250 M
0.00040M
HNO
nm
10.00 ml
0. 250
(D ano CO.2512H)
10.00 ml
0.00 ml
0.olM
2
0.0bo-00soz000-0s 0.00001 O 250 +0. iu
10.00 ml
8.00 ml
2.00 ml
0-OIM 0.00016M 13.9
o 8569952
3
10.00 ml
6.00 ml
4.00 ml
D.350012414
0. O1M 0.0012M 3.3 |0 6326
R.
Efe] LHSCN] I fesCN] l IH' ]
4
10.00 ml
4.00 ml
6.00 ml
0. Olm 0.000 SM 37.1 |0.4Au
0. 250
Table 2
kaya l. 259
Sample Volume of Volume of Volume of
0.0200 M KSCN
Fe(NO)3
Initial
0. 250095904
Initial
%T
Absorbanc
0.250 M
0,00040M HNO,
[Fe]
[HSCN]
e at 445
E Fets] [HSCN1 [FesON t2] [H'1
nm
1
10.00 ml
10,00 ml
0.00 ml
0-0lM 0 23.
0.6364
0.0100
0.00a
0-350
key = 0.87
ーズ
E 0-oloo-0.0006H 0-0002-0.00 o-0000067386|0.35o +D.00067386
0. a099933
2.
10,00 ml
8.00 ml
2.00 ml
-J
0.OIM 0.000IEM 31.9 0.4962
3
10,00 ml
6.00 ml
4.00 ml
0.00O|2 M44. I O. 3556
44.10. 3556
0.000067 386
0.2500067386
0.0IM
4
10,00 ml
4.00 ml
6.00 ml
TH
I Fe'3] IHSCNI
0-0100
0.OIM 0.000YM 55.8
O. 25 34
5/
(0.000046770.2o
10.00 ml
4,00 ml
6.00 ml
Ife SaN 21
warm
0.000g.
0. 250
Kay= 0-3505.
2- lg(231): 0.6364
2-ly (s: 0. 4962
2.
0.30499533.
0-000153310.0000 467 297
.25000 4673
2- ty (44.1):0.3556
2-し55.3): 0.25らs4
Averge Ka
1.65 658 + 1.299 +u.s7+0.55030
=1.08402

3t
Fo
+14
[fa SCNITH]
e sca1
Abs
CFesaN]
+ H* cag.
Fe cag + HSCN,a4s Fe ScN
O.100
0.250
C.
0.250 +3
KSNA HNO 3 ClassS HSCN t KNO3
4.00X 10* M
0-250M
y=4947.6x +0222.
R230.9911.

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