8.6 Indicator
Authored by Lawrence kok
Chemistry
11th - 12th Grade
Used 35+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the effect on HIn indicator when NaOH is added to it?
Equilibrium shifts to right and more of colour B is seen.
Equilibrium shifts to left and more of colour B is seen.
Equilibrium shifts to right and more of colour A is seen
Equilibrium shifts to left and more of colour A is seen
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Bromophenol blue changes from yellow to blue over pH of 3.0 to 4.6. Which statement is correct?
Molecules of bromophenol blue, HIn, are blue.
pH < 3.0, bromophenol blue contain more ion, In–, than HIn.
pKa of bromophenol blue is between 3.0 and 4.6.
Bromophenol blue is suitable to titrate CH3COOH with KOH.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Indicator, HIn is used in titration. Which statement on dissociation of indicator, is correct?
In strong alkaline, colour B would be observed.
In strong acidic, colour B would be observed.
[In–] is greater than [HIn] at equivalence point.
In weakly acidic, colour B would be observed.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which indicator would be appropriate for titrating weak base, CH3CH2NH2, with nitric acid?
Bromophenol blue (pKa = 4.1)
Bromothymol blue (pKa = 7.3)
Phenol red (pKa = 8.0)
Phenolphthalein (pKa = 9.50)
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which statement about indicators is always correct?
Mid-point of an indicator’s colour change is at pH = 7.
pH range is greater for indicators with higher pKa values
Colour red indicates an acidic solution
pKa value of the indicator is within its pH range.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Acid-base indicator has pKa value of 4.0. At what pH will this indicator change colour?
2
4
8
12
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which could use phenolphthalein (pKa=9.5) and not methyl orange (pKa=3.46) as indicator?
NaOH and HNO3
NH3 and CH3COOH
NaOH and CH3COOH
NH3 and HNO3
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