Data The following tables include calculated as well as observed and recorded data for Part 1 and Part 2 of the pH study experiment. System I 0.010 M HCI 0.00010 М HC 0.0010 М НС 0.0010 M NAOH Calculated pH Indicator pH 2 3 4 Meter pH 1.88 2.62 3.25 9.46 System II 0.010 MHAC 0.0010 М НАс 0.00010 M HAC 0.0010 M NH, Calculated pH Indicator pH 3.5 4 8 Meter pH 3.26 3.65 3.67 9.51

Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter14: Applications Of Ultraviolet-visible Molecular Absorption Spectrometry
Section: Chapter Questions
Problem 14.10QAP: The acid-base indicator HIn undergoes the following reaction in dilute aqueous solution:...
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System I

* 0.010 M   HCl

 

 

*  0.0010 NaOH

 

System II

* 0.010 M   ( HA )

 

 

*  0.0010 M  (  B )

 

System IV

*  Buffer

Data
The following tables include calculated as well as observed and recorded data for Part 1 and Part 2 of
the pH study experiment.
System I
0.010 М НСl
0.0010 М НCI
0.00010 M HCl
0.0010 M NaOH
Calculated pH
Indicator pH
2
3
4
9
Meter pH
1.88
2.62
3.25
9.46
System II
0.010 МНАс
0.0010 M HAC
0.00010 M HAC
0.0010 M NH,
Calculated pH
Indicator pH
3.5
8
Meter pH
3.26
3.65
3.67
9.51
Transcribed Image Text:Data The following tables include calculated as well as observed and recorded data for Part 1 and Part 2 of the pH study experiment. System I 0.010 М НСl 0.0010 М НCI 0.00010 M HCl 0.0010 M NaOH Calculated pH Indicator pH 2 3 4 9 Meter pH 1.88 2.62 3.25 9.46 System II 0.010 МНАс 0.0010 M HAC 0.00010 M HAC 0.0010 M NH, Calculated pH Indicator pH 3.5 8 Meter pH 3.26 3.65 3.67 9.51
System II
Nacl (aq) | NAAC (aq)
NH,CI (aq)
NH,Ac (aq)
NaHCO, (aq)
Na,CO, (aq)
Predicted pH
(acidic or basic)
Indicator pH
7
8
5
7.5
11
Meter pH
6.36
7.35
5.71
7.45
8.48
10.96
System IV
Water
Water +1 Drop 6 M HCI
Water
Water +1 Drop 6 M
NaOH
Meter pH
7.20
2.24
Mass: NaCH,cOo(g)
4.157
Volume: 6.0 M CH,COOH (mL)
8.45
System IV
HAC/NaAc Buffer
Calculated pH
Indicator pH
4
Meter pH
4.75
# Drops 6 M HCl to Change pH 1 Unit
30
# Drops 6 M NaOH to Change pH 1 Unit
Transcribed Image Text:System II Nacl (aq) | NAAC (aq) NH,CI (aq) NH,Ac (aq) NaHCO, (aq) Na,CO, (aq) Predicted pH (acidic or basic) Indicator pH 7 8 5 7.5 11 Meter pH 6.36 7.35 5.71 7.45 8.48 10.96 System IV Water Water +1 Drop 6 M HCI Water Water +1 Drop 6 M NaOH Meter pH 7.20 2.24 Mass: NaCH,cOo(g) 4.157 Volume: 6.0 M CH,COOH (mL) 8.45 System IV HAC/NaAc Buffer Calculated pH Indicator pH 4 Meter pH 4.75 # Drops 6 M HCl to Change pH 1 Unit 30 # Drops 6 M NaOH to Change pH 1 Unit
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Publisher:
Cengage Learning