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I Naso Kcro Feso

This document discusses indicators used in different titration reactions. It provides the correct indicator for each of the following reactions: (1) phenolphthalein for the titration of a weak acid with a strong base, (2) KMnO4 for the titration of KMnO4 with FeC2O4, (3) starch for the titration of I2 with Na2S2O3, and (4) potassium hexacyanoferrate(II) as an external indicator for the titration of K2Cr2O7 with FeSO4. It then provides the reaction for using potassium hexacyanoferrate(II) as an external indicator.

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Jack Lupino
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93 views1 page

I Naso Kcro Feso

This document discusses indicators used in different titration reactions. It provides the correct indicator for each of the following reactions: (1) phenolphthalein for the titration of a weak acid with a strong base, (2) KMnO4 for the titration of KMnO4 with FeC2O4, (3) starch for the titration of I2 with Na2S2O3, and (4) potassium hexacyanoferrate(II) as an external indicator for the titration of K2Cr2O7 with FeSO4. It then provides the reaction for using potassium hexacyanoferrate(II) as an external indicator.

Uploaded by

Jack Lupino
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Question: 18. Choose the correct regarding indicator Titration Indicator (1) NaOH vs.

s. CH3COOH Phenolphthalein (2) KMnO4 vs. FeCZO4 KMnO4


(3) l2 vs. Na28203 Starch (4) K2Cr207 vs. FeSO4 K3[Fe(CN)6] as external

indicator

Date: 24-02-2018/F-4062/A2894
Answer:
(a) Weak Acid + Strong Base  Phenolphthalein as indicator
(b) KMnO4  FeC2O4  KMnO4 as indicator

(c) I2  Na2S2O3  Starch is used as indicator

(d) K2Cr2O7  FeSO4 K 3 Fe  CN6  is used as an external indicator

K3 Fe  CN6   FeSO4 


Fe3 Fe  CN6   3K 2SO4
2

Ferro-ferricyanide
(deep blue color)

Best Wishes!
Aakash “Ask an Expert” Team

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