Friday
April 24, 2015

Homework Help: Chemistry

Posted by Joe on Sunday, February 28, 2010 at 12:38pm.

HI, we conducted a qualitative analysis, to identify the cations in an unknown sollution..trying to determine whether it had Al 3+, Fe (3), and Lead ions..i am having trouble understanding some parts of the procedure. before testing for aluminum and iron, hydrogen peroxide was added to the solution, and then enough NaOH to make it a basic solution,( note that the solution had been treated with HCl beforehand), i know hydrogen peroxide is an oxidizing agent but i dont completely understand the function of it and why teh solution was made basic.
Furthermore, when testiing for aluminum the solution was treated with acid and base many times, i know aluminum is amphiprotic, but once again i would realy like some clearification. Iv heard that adding an acid or base changes the state of the analyte but can someone please clearify all this properly?

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