48174
Description
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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SODIUM THIOSULFATE
AS REDUCING AGENT
- Reduces I2 to 2I-
- Not a Primary standard
- Contains water of
crystallisation
- Not Pure
- Contains water of
crystallisation
- Starch Indicator
- added when pale yellow
- Endpoint---Blue balck to colourless
- Endpoint---Blue balck to colourless
- added when pale yellow
- 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
- Cl- would be oxidised
- Ensures complete
oxidation of I- to I2
- H2SO4
- Golden brown colour of I2
- I2 not standard
- Vapourises / sublimes ,
does not dissolve in
water
- standard soln. produced by
oxidation usind excess KI and
acidified oxidisinf agent
- Vapourises / sublimes ,
does not dissolve in
water
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