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Rapid fixers - chloride X sulphate



 
 
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  #1  
Old February 4th 04, 07:24 PM
Jorge Omar
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Default Rapid fixers - chloride X sulphate

Hello,

Thre are rapid fixers made by mixing hypo with ammonium chloride or
sulphate (Kodak's F-7 and F-9).

It just happens that Kodak F-7 uses 50g of chloride, F-9 uses 60g of
sulphate.

The molecular weight of chloride is 53.49g and of sulphate is 132.14g.

Doesn't it looks like there is too little sulphate in F-9?

Thanks,

Jorge
  #2  
Old February 4th 04, 08:24 PM
Jean-David Beyer
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Default Rapid fixers - chloride X sulphate

Jorge Omar wrote:
Hello,

Thre are rapid fixers made by mixing hypo with ammonium chloride or
sulphate (Kodak's F-7 and F-9).

It just happens that Kodak F-7 uses 50g of chloride, F-9 uses 60g of
sulphate.

The molecular weight of chloride is 53.49g and of sulphate is
132.14g.

Doesn't it looks like there is too little sulphate in F-9?

Sulphate is not what matters; it is the ammonium ions that count. There
is only one ammonium ion in amminium chloride, whereas there are two in
ammonium sulphate.

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  #3  
Old February 4th 04, 10:48 PM
Jorge Omar
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Default Rapid fixers - chloride X sulphate

Thanks, Jean-David.
I've almost forgotten my chemistry classes; taking the 2 NH4 in account
they are very much equivalent.

Jorge

Jean-David Beyer wrote in :

Jorge Omar wrote:
Hello,

Thre are rapid fixers made by mixing hypo with ammonium chloride or
sulphate (Kodak's F-7 and F-9).

It just happens that Kodak F-7 uses 50g of chloride, F-9 uses 60g of
sulphate.

The molecular weight of chloride is 53.49g and of sulphate is
132.14g.

Doesn't it looks like there is too little sulphate in F-9?

Sulphate is not what matters; it is the ammonium ions that count. There
is only one ammonium ion in amminium chloride, whereas there are two in
ammonium sulphate.


 




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