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Unread 03/20/2018, 05:25 PM   #6
Dan_P
Registered Member
 
Join Date: Aug 2014
Posts: 1,432
Yes, the chemistry rules for titrations still apply for the kits. The difficulty is judging when the color change has stopped because you are starting with one color that transitions to another color which you have not seen before. For some kits the blended color of the initial and final colors may not appear different from the final color to your eye.

As someone has already mentioned, perform a titration, but keep adding titrant once you reach what you judge to be the end point. You may see a subtle diiference after a drop or two. Do this a couple times to train your eye to discern the final color.

Another thing to try is to look at a highlight, those white spots or lines that appear near the bottom of the test vial. Because they are so bright, you may be able to discern a red violet from a blue violet better than when viewing the solution color through the side. You will just have fiddle with your viewing angle to find what works for you. A piece of white paper held behind the test vial is another way to get more bright light through the solution.


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