CHem - OT

[michal lukac]

Niekde na internete som nasiel ako zafarbit nerez (uz som to tu raz pisal) a 
tam je treba ten Na2Cr......

H2SO4........1 lit
Na2Cr2O7......7,5 g   -  Dvojchroman sodny
70-95 stC 0,06A/dm2-1,3V,object=anode,cathode=lead

Ale uz mi p J.Hanzal napisal ako to preratat.......dik

ale bola pri tom taka poznamka:
Colour sequence:brown-blue-yellow-redish brown-purple-green  -> neviete 
nahodou co to znamena.....
dik michal.



----- Original Message ----- 
From: "Pavel Novotný" <novotny.pp@atlas.cz>
To: "'HW-news'" <hw-list@hw.cz>
Sent: Monday, March 21, 2005 11:22 AM
Subject: RE: CHem - OT


Proc ne, to první jen obsahuje dve molekuly vody a druha sul je bezvoda,
nepisete k cemu to potrebujete, ale obecne pokud vam nevadi pritomnost
chemicky vazane vody tak není problem. Nezapomente, ze zvodneleho hydratu
budete muset pouzit vice !


________________________________

From: hw-list-bounces@list.hw.cz [mailto:hw-list-bounces@list.hw.cz] On
Behalf Of michal lukac
Sent: Monday, March 21, 2005 12:03 PM
To: hw-list@list.hw.cz
Subject: CHem - OT


Zdravim.
Prosim vedel by mi niekto povedat ci je velky rozdiel medzi
chemikaliami: Dvojchroman sodny dihydrat Na2Cr2O7.2H2O a dvojchroman sodny
Na2Cr2O7?
dvojchroman sodny mam v jednom postupe na leptanie a zohnat sa da len ten
dihydrat.

Da sa pouzit aj tento dihydrat....?
Sorry za trochu chem. OT.
dik. michal

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