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topic 17944

Finding the purity of silver in silver alloys



I am doing silver related business in Tamil Nadu.We are having Small Testing Lab where we test % silver content in one gram of silver alloys(silver,brass,copper - solution is white colour). We are finding the result through volumetric method. Our procedure is, First , one gram of silver is dissolved in HNO3 and diluted to 100 ml. Then 5 ml of solution is titrated with Ammonium thiocynate.We made the calculation by making the ratio with amount of Ammonium thiocynate needed for pure silver and the sample.

But my question is, I want to make the same procedure with colorimeter. Is is possible? If yes mean tell the answer quickly.

Thanking you,

- Salem,Tamil Nadu, India


Yes, if you can connect a fiber optic probe to your colorimeter it should be possible to detect the end point colorimetrically (although for this particular titration it may not be worth the bother for most people, it is a setup I have often found useful). It will be difficult to get a sharp end-point, though, unless you can titrate at a constant rate and record the data automatically during the titration, for further analysis. When using an automatic titrator for colorimetric titrations, if it is not specifically equipped for them, you may be able to "cheat" it into "thinking" that it executes a potentiometric titration by connecting the colorimeter output to the same port that would accept your pH electrode. The data will be recorded as volts rather than absorbance units, but it will be possible to analyze it anyway.

Emanuel Cooper
IBM - Yorktown Heights, New York

September 3, 2008

would you please tell me a method for analysing silver deposit by potentiometric titration?

Heylin Yudhis
hobbyist - Jakarta, Indonesia


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