How do I determine the amount of copper in brass?

Subject: How do I determine the amount of copper in brass?

Date: Mon Jan 24 06:08:49 2000
Posted by Liddy Barrow
Grade level: 10-12 School: King Edward VII Upper School
City: Leicestershire State/Province: No state entered. Country: England
Area of science: Chemistry
ID: 948715729.Ch

Message:


The method I used was to dissolve 3g of brass in 20cm3 of nitric acid. 
This was then made up to 250cm3 by the addition of distilled water. 25cm3 
of this solution was then put into a conical flask and sodium carbonate 
solution was added to this to neutralise it. The precipate obtained was 
then dissolved by the addition of dilute acetic acid. This solution was 
then titrated against 0.1moldm-3 sodium thiosulphate.The titration was 
stopped when the solution turned pale yellow and then starch indicator was 
added. This was repeated 3 times and the average amount of sodium 
thiosulphate used in the titration was 29.13cm3. I don't understand how 
this result can be used to determine the amount of copper in brass.

Re: How do I determine the amount of copper in brass?

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