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48174
SODIUM THIOSULFATE AS REDUCING AGENT
Description
Chemistry Mind Map on SODIUM THIOSULFATE AS REDUCING AGENT, created by iskscience on 16/04/2013.
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chemistry
chemistry
Mind Map by
iskscience
, updated more than 1 year ago
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Created by
iskscience
over 11 years ago
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Resource summary
SODIUM THIOSULFATE AS REDUCING AGENT
Reduces I2 to 2I-
Not a Primary standard
Contains water of crystallisation
Not Pure
Starch Indicator
added when pale yellow
Endpoint---Blue balck to colourless
Bleach (Htpochlorite ion)oxidises / liberates I2 from I- ions
Golden brown colour of I2
Excess KI ensures KI present to dissolve I2 and known concentration I" liberated
I2 dissolves in KI as I3-
Only in acidic conditions
H2SO4
HCL not used
Cl- would be oxidised
Ensures complete oxidation of I- to I2
I2 not standard
Vapourises / sublimes , does not dissolve in water
standard soln. produced by oxidation usind excess KI and acidified oxidisinf agent
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