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July 22, 2014

Homework Help: Chemistry

Posted by candy on Friday, September 24, 2010 at 11:58pm.

This is a limit test for chlorides.
1.0g of NaOH sample was dissolved in 5ml of deionized water, acidified with 4ml of concentrated nitric acid (65%) and diluted to 15ml with deionized water. (Test tube A)
10ml of 50ppm Standard NaCl solution was prepared. 5ml of water was added, followed by 1ml of dilute nitric acid. (Test tube B)
1ml of AgNO3 was added to each of the test tubes and compared for opalescence.

Can you explain why we need to add 4ml of concentrated nitric acid and how was the 4ml derived?

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