hamman Posted November 29, 2005 Share Posted November 29, 2005 I recently did a backwards titration... Instead of adding base to acid and indicator, I added acid to base and indicator. The unusual thing was that more of the acid was used than base. Eg. The same titration was carried out normally, add base to acid-indicator, and I get oh 25 cm cube of base used to change indicator color. Now I reverse things around and add acid to base-indicator and get 45 cm cube of acid used! I was assuming on the same volume readings either way:confused: Link to comment Share on other sites More sharing options...
RyanJ Posted November 29, 2005 Share Posted November 29, 2005 I recently did a backwards titration...Instead of adding base to acid and indicator' date=' I added acid to base and indicator. The unusual thing was that more of the acid was used than base. Eg. The same titration was carried out normally, add base to acid-indicator, and I get oh 25 cm cube of base used to change indicator color. Now I reverse things around and add acid to base-indicator and get 45 cm cube of acid used! I was assuming on the same volume readings either way:confused:[/quote'] Did you repeat the experimen, could there have been a mistake in your experiment? If it was a mistake, it happens all the time (Especailly too me ). I suggest you do each experiment 3 times and then use the average results, they are normally more accurate, if you still get the same answer I have no idea why! Cheers, Ryan Jones Link to comment Share on other sites More sharing options...
hamman Posted November 29, 2005 Author Share Posted November 29, 2005 did it 8 times in a 16-well!!! no errors, im sure! Link to comment Share on other sites More sharing options...
akcapr Posted November 29, 2005 Share Posted November 29, 2005 what indicator did you use Link to comment Share on other sites More sharing options...
Tetrahedrite Posted November 30, 2005 Share Posted November 30, 2005 You simply need to think a little more laterally, your results indicate that the concentration of the acid is lower than that of the base. What size aliquot did you use for each titration? The only time you will get an exactly equal volume of titrant for both the acid and the base is when there is a 1:1 molar ratio (concentration) of these components. Link to comment Share on other sites More sharing options...
hamman Posted November 30, 2005 Author Share Posted November 30, 2005 Thanks Tetrahedrite. That must be it! Link to comment Share on other sites More sharing options...
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