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Sodium hypophosphite purity is 102%, how to explain it?
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Topic: Sodium hypophosphite purity is 102%, how to explain it? (Read 5979 times)
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zengxin
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Sodium hypophosphite purity is 102%, how to explain it?
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on:
September 16, 2011, 04:58:26 AM »
Sodium hypophosphite purity is 102%, how to explain it?
Specification:
NaH2PO2.H2O %≥102
Na2HPO3 %≤0.3
Ca %≤0.001
Fe %≤0.0002
SO4 %≤0.01
CL %≤0.003
PH 6--8
Pb %≤0.0001
Anyone can explain that?
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Borek
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I am known to be occasionally wrong.
Re: Sodium hypophosphite purity is 102%, how to explain it?
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Reply #1 on:
September 16, 2011, 05:30:54 AM »
Idiocy IMHO. Probably some artifact of assay method or hygroscopicity.
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ChemBuddy
chemical calculators - stoichiometry, pH, concentration, buffer preparation,
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zengxin
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Re: Sodium hypophosphite purity is 102%, how to explain it?
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Reply #2 on:
September 18, 2011, 10:16:03 PM »
You can check the Spec. of Sodium hypophosphite on alibaba, the purity is 102%. I don't know why ?
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AWK
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Re: Sodium hypophosphite purity is 102%, how to explain it?
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September 20, 2011, 04:39:06 AM »
Purity is determined by a redox titration, but the reagent contains also other reductor Na2HPO3 and titration determines all reductors.
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AWK
crosemeyer
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Re: Sodium hypophosphite purity is 102%, how to explain it?
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Reply #4 on:
September 23, 2011, 05:50:25 PM »
Couldn't this simply be due to w/v% being used?
Like 102g hypophosphite in 100mL water would be 102%w/v.
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Sodium hypophosphite purity is 102%, how to explain it?