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NaClFind LEf
Module 3
Practical: TitrationQuestions2002-7
Welcome and thanks for visiting.
F Scullion. JustChemy.Com
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Introduction
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Titration Graphs. Strong Alkali + Strong Acid Weak Alkali + Strong Acic
Strong Alkali + Weak Acid Weak Alkali + Weak Acid
pH pH
pH pH
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IndicatorTable
Indicator pH Range pKa Acid Form Base Form
methyl violet 0.0- 1.6 0.8 yellow blue
thymol blue 1.2- 2.8 1.6 red yellow
methyl yellow 2.9- 4.0 3.3 red yellow
methyl orange 3.1- 4.4 4.2 red yellow
bromocresol green
3.8- 5.4 4.7 yellow blue
methyl red 4.2- 6.2 5.0 red yellow
chlorophenol red 4.8- 6.4 6.0 yellow red
bromothymol blue
6.0- 7.6 7.1 yellow blue
phenol red 6.4- 8.0 7.1 yellow red
cresol purple 7.4- 9.0 8.3 yellow purple
thymol blue 8.0- 9.6 8.9 yellow blue
phenolphthalein 8.0- 9.8 9.7 colorless red
thymolphthalein 9.3-10.5 9.9 colorless blue
alizarin yellow R 10.1-12.0 11.0 yellow red
indigo carmine 11.4-13.0 12.2 blue yellow
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Phenolphthalein in alkali
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Calculate the concentration of thepotassium hydroxide solution (i) in mol/dm3 (mol per litre) (relative atomic masses: H=1; O=16;
K=39)
KOH + HNO3 = KNO3 + H2O
M mol/dm3 ? 0.1V 25.0 22.5Mol 1 1
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2004 Practical 1
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2004 Practical 1
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1 mole of KIO3 make 3 mole of I2
This 3 mol of I2 requires (3x2) = 6 mol Na2S2O3
So 1 mole of KIO3 = 6 mole Na2S2O3
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Thio
Iodine – Thiosulphate Titration
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2004/P2
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2005/P1
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Weak Acid + Strong Alkali
Phenolphthalein changes colour in range 8 - 10
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2005/P2
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Sodium carbonate
Methyl Orange turns colour in range 3 – 4.5
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Red to Yellow
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2006/P1
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1 mole of KIO3 make 3 mole of I2
This 3 mol of I2 requires (3x2) = 6 mol Na2S2O3
So 1 mole of KIO3 = 6 mole Na2S2O3
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Thio
Iodine – Thiosulphate Titration
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2006/P2
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2007/P1
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Strong Acid + Strong Alkali
Phenolphthalein changes colour in pH range 8 - 10
Methyl Orange changes colour in pH range 3 - 4.5
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2007/P2
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That’s it. Thanks for listening.
Do consider using the other three parts in this Series: -
Observation & Deduction Planning Structured Questions
Good luck with your Practical Examination.
F Scullion, JustChemy.Com