134. To determine the Na2CO3 content in soda ash used for cooking rosin glue when sizing paper, a sample of it equal to 2.110 g was dissolved in a volumetric flask with a capacity of 250 cm3. An aliquot portion of the resulting solution with a volume of 5 cm3 was titrated using a high-frequency method with a 0.1 mol/dm3 HCl solution (k = 0.9860). Calculate the percentage of Na2CO3 in the sample from the results of the high-frequency titration curve based on the following data
VHCl, cm3 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
I, µA 10 20 33 45 56 66 80 65 49 34 16

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