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This paper examines to make a potentiometric titration by a weak acid with 0,1 M NaOH Below here it has to be relevant to make a titration curve and makes us of differential arithmetic which has been accounted. By means of a titration curve it has be possible to read the half equivalent- the equivalent point. Hereafter there are put forward an equation system which has resulted in a new titration curve. The calculate titration curve has been in agreement with the experimental titration curve among other this because the equivalent point finds on the same place on both of them. Afterwards the differential arithmetic has been discussed both for a general graph and for the experimental graph. The results show that it is a good method to decide the equivalent point and that it could be usable but it has some limitations.

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