Q5. Titration curves, labelled E, F, G and H, for combinations of different aqueous solutions of acids and bases are shown below. All solutions have concentrations of 0.1 mol dm-³. (a) PH 14- 12- PH 10- 8- 6- 6- 4- 2- 0 0 14- 12- 10- 8- 6- 4- 2- 14 12 10- en 8- PH 6- 4- 2 10 20 30 40 50 Volume/cm³ 0- E 0 Page 8 of 14 10 20 30 40 50 Volume/cm³ G PH 14. 12 10- F 6- 4- 2- 0 0 10 20 30 40 50 Volume/cm³ H 0 10 20 30 40 50 Volume/cm³ In this part of the question, write the appropriate letter in each box. From the curves E, F, G and H, choose the curve produced by the addition of
Q5. Titration curves, labelled E, F, G and H, for combinations of different aqueous solutions of acids and bases are shown below. All solutions have concentrations of 0.1 mol dm-³. (a) PH 14- 12- PH 10- 8- 6- 6- 4- 2- 0 0 14- 12- 10- 8- 6- 4- 2- 14 12 10- en 8- PH 6- 4- 2 10 20 30 40 50 Volume/cm³ 0- E 0 Page 8 of 14 10 20 30 40 50 Volume/cm³ G PH 14. 12 10- F 6- 4- 2- 0 0 10 20 30 40 50 Volume/cm³ H 0 10 20 30 40 50 Volume/cm³ In this part of the question, write the appropriate letter in each box. From the curves E, F, G and H, choose the curve produced by the addition of
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Help! Please solve Q5 all parts
Transcribed Image Text:(b)
The table shows information about some acid-base indicators.
(i)
(ii)
Indicator
pentamethoxy red
naphthyl red
4-nitrophenol
cresol purple
pentamethoxy red
naphthyl red
4-nitrophenol
pH range
cresol purple
1.2-3.2
Page 9 of 14
3.7-5.0
5.6-7.0
7.6-9.2
Lower pH
colour
violet
red
colourless
yellow
Which indicator in the table could be used for the titration that produces curve
E but not for the titration that produces curve F?
Tick (✓) one box.
Higher pH colour
colourless
yellow
yellow
purple
Give the colour change at the end point of the titration that produces curve H
when naphthyl red is used as the indicator.
(iii) A beaker contains 25 cm³ of a buffer solution at pH = 6.0
Two drops of each of the four indicators in the table are added to this solution.
State the colour of the mixture of indicators in this buffer solution.
You should assume that the indicators do not react with each other.
Transcribed Image Text:Q5.
Titration curves, labelled E, F, G and H, for combinations of different aqueous solutions of
acids and bases are shown below.
All solutions have concentrations of 0.1 mol dm-³.
PH
PH
(ii)
14
12-
10-
(iii)
8-
14.
12
10-
us
PH
6-
4-
2-
6-
6-
4-
E
2-
Page 8 of 14
0
0 10 20 30 40 50
Volume/cm³
G
14-
12-
10-
8-
Ľ
6-
1907
4-
2-
0-
0
10 20 30 40 50
Volume/cm³
PH
0
0 10 20 30 40 50
Volume/cm³
14
12
10-
(i) sodium hydroxide to 25 cm³ of ethanoic acid
ammonia to 25 cm³ hydrobromic acid
8-
6-
4-
2
F
0
(a)
In this part of the question, write the appropriate letter in each box.
From the curves E, F, G and H, choose the curve produced by the addition of
H
10 20 30 40 50
Volume/cm³
hydrochloric acid to 25 cm³ of potassium hydroxide
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