3. During potentiometric titration of an aliquot portion (V ml) of a solution containing a mixture of Na2CO3, NaOH, with a titrant HCl with a concentration of 0.1000 N, the following data were obtained:

VT, ml 13.5 14.0 14.5 15.0 15.5 16.0 19.0 20.0 20.5 21.0 21.5
pH 9.4 8.9 8.6 7.9 7.0 6.7 5.8 5.2 3.9 3.0 2.7
VT − volume of titrant, ml.
Using the differential titration curve, determine the content of components in the mixture (in g/l) at the values ​​of V given in the table below.
Option No. 3
V, ml 15

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