A Consider the pH titration curve above (pH vs volume in ml). The pk, of the weak base being titrated and the pH of the equivalence point are, respectively: 12 11 10 7 6. 5 4 2 1 10 20 30 40 O 25 and 4.0 • 5.4 and 4.5 O 11.2 and 5.4 O 11.2 and 4.5 O 45 and 5.4 Based on the indicator information above, which of the following indicators could be used successfuly in the titration in Part A? (Select all correct responses) Indicator Colour (low pH – high pH) pK. methyl yellow red-yellow 3.1 methyl orange red-yellow 3.7 bromophenol blue yellow-blue 4.2 bromocresol green yellow-blue 4.7 methyl red pink-yellow 5.1 bromocresol purple yellow-purple 6.3 bromothymol blue yellow-blue 7.0 phenol red yellow-red 7.9 O phenol red cresol red yellow-red 8.3 O bromocresol purple thymol blue yellow-blue 8.9 O methyl yelow thymolphthalein colourless-blue 9.2 O bromothymol blue O hymol blue O hymolphthalein Part C Baseu on the table above, what colour is methyl orange at pH3? Submit Request Answer Part In Part A above, the equivalence point pH is due to: O excess strong acid being added O buffering of the solution at this point O hydrolysis of the weak base being titrated O the pH-neutral products of the titration O dissociation of the conjugate acid of the weak base being titrated Submit Request Answer
A Consider the pH titration curve above (pH vs volume in ml). The pk, of the weak base being titrated and the pH of the equivalence point are, respectively: 12 11 10 7 6. 5 4 2 1 10 20 30 40 O 25 and 4.0 • 5.4 and 4.5 O 11.2 and 5.4 O 11.2 and 4.5 O 45 and 5.4 Based on the indicator information above, which of the following indicators could be used successfuly in the titration in Part A? (Select all correct responses) Indicator Colour (low pH – high pH) pK. methyl yellow red-yellow 3.1 methyl orange red-yellow 3.7 bromophenol blue yellow-blue 4.2 bromocresol green yellow-blue 4.7 methyl red pink-yellow 5.1 bromocresol purple yellow-purple 6.3 bromothymol blue yellow-blue 7.0 phenol red yellow-red 7.9 O phenol red cresol red yellow-red 8.3 O bromocresol purple thymol blue yellow-blue 8.9 O methyl yelow thymolphthalein colourless-blue 9.2 O bromothymol blue O hymol blue O hymolphthalein Part C Baseu on the table above, what colour is methyl orange at pH3? Submit Request Answer Part In Part A above, the equivalence point pH is due to: O excess strong acid being added O buffering of the solution at this point O hydrolysis of the weak base being titrated O the pH-neutral products of the titration O dissociation of the conjugate acid of the weak base being titrated Submit Request Answer
Chapter12: Spectrochemical Methods
Section: Chapter Questions
Problem 15P
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Transcribed Image Text:A
Consider the pH titration curve above (pH vs volume in ml). The pk, of the
weak base being titrated and the pH of the equivalence point are, respectively:
12
11
10
8
7
5
4
2
1
10
20
30
40
O 2.5 and 4.0
• 5.4 and 4.5
O 11.2 and 5.4
O 11.2 and 4.5
O 4.5 and 5.4
Based on the indicator information above, which of the following indicators could
be used successfuly in the titration in Part A? (Select all correct responses.
Indicator
Colour (low pH – high pH)
pK,
methyl yellow
red-yellow
3.1
methyl orange
red-yellow
3.7
bromophenol blue
yellow-blue
4.2
bromocresol green
yellow-blue
4.7
methyl red
pink-yellow
5.1
bromocresol purple
bromothymol blue
yellow-purple
6.3
yellow-blue
7.0
phenol red
yellow-red
7.9
O phenol red
cresol red
yellow-red
8.3
O bromocresol purple
thymol blue
yellow-blue
8.9
O methyl yellow
thymolphthalein
colourless-blue
9.2
O bromothymol blue
O thymol blue
O thymolphthalein
Part C
Baseu on the table above, what colour is methyl orange at pH3?
Submit
Request Answer
Part
In Part A above, the equivalence point pH is due to:
O excess strong acid being added
O buffering of the solution at this point
O hydrolysis of the weak base being titrated
O the pH-neutral products of the titration
O dissociation of the conjugate acid of the weak base being titrated
Submit
Request Answer
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