[Ray Rogers]

Go here to see the spelling of benzene sulfinic acid in czech.

http://environmentalchemistry.com/yo...dihydrate.html

There is more doubt growing in my mind about this. Sulfinic acids and Sulfonic acids are distinct in Polish, Czech and all other languages I have researched.

One is -SO2H and the other is SO3H, and they differ in activity much as sulfite and sulfate do, thus explaining the antioxidant properties claimed for the Sulfinates in literature.

PE

Just to put things side by side,

Benzensulfinan sodny =
Benzenesulfinic acid, sodium salt, dihydrate
CAS: 25932-11-0

and

Benzensulfonan sodný =
Benzenesulfonic acid sodium salt
CAS: 515-42-4

Notes:
1.
On the Czech words for sodium given here, an accent mark is found on only one of the two, but this is possibly an error IDK.

(Sometimes non-speakers leave off such marks when they don't know how to make them.)

2.
Ian mentioned Polish... are Czech and Polish the same here?

3.
There are still a few outstanding points;

a. Kirks q. about Benzyl Alcohol
b. My q. about AO activity in general
c. Ian's q. about sulphonate functioning as an AO and
it's infrequent mention as an AO and its more common mention in
association with photothermography.