WhyDotKom - 11-9-2013 at 07:40
hey, how can i analize that a sample had an ClO4- cation inside?
thank's before
Hexavalent - 11-9-2013 at 07:50
I appreciate that English may not be your first language, but please do try to spell scientific terms correctly, i.e. "Qualitative analytical
chemistry", "analyse" etc.
Please give more information about what exactly you're testing for, and why, and we may be able to help you further.
BTW, ClO4- is a negative ion, and hence is termed an anion.
[Edited on 11-9-2013 by Hexavalent]
Metacelsus - 11-9-2013 at 09:15
Are you trying to determine perchlorate concentration? Do you know any of the other ions present?
If there is no chlorate present, you could add potassium chloride to precipitate potassium perchlorate. This would only work for relatively
concentrated solutions, because potassium perchlorate is slightly soluble in water.
WhyDotKom - 11-9-2013 at 09:20
thanks to tell me that
i heard (but don't know is this true) that we can add the sample with HCl and make white gases?
sorry about my english 
WhyDotKom - 11-9-2013 at 09:23
no, i dont know the another ions
only to analyze is the sample contain a ClO4- anion
Hexavalent - 11-9-2013 at 11:09
Are you trying to evaluate the purity of a perchlorate salt sample, or trying to detect it as an impurity in something else? I suspect the former, but
vague details will only yield vague answers.
Ascaridole - 11-9-2013 at 14:03
If memory serves me correctly methylene blue will go from blue to violet in the presence of perchlorate ions. Wont give you a quantitative analysis of
the perchlorate ions but it will let you know if they are present.