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Topic: Sodium hypophosphite purity is 102%, how to explain it?  (Read 5977 times)

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Offline zengxin

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Sodium hypophosphite purity is 102%, how to explain it?
« 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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Offline Borek

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Re: Sodium hypophosphite purity is 102%, how to explain it?
« Reply #1 on: September 16, 2011, 05:30:54 AM »
Idiocy IMHO. Probably some artifact of assay method or hygroscopicity.
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Offline zengxin

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Re: Sodium hypophosphite purity is 102%, how to explain it?
« 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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Offline AWK

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Re: Sodium hypophosphite purity is 102%, how to explain it?
« Reply #3 on: 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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Offline crosemeyer

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Re: Sodium hypophosphite purity is 102%, how to explain it?
« 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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