When titrating 20.00 ml of a solution containing sodium hydroxide and sodium carbonate with 0.1053 N hydrochloric acid, the following data were obtained:

VT, ml 13 14 14.5 15 15.5 16 19 20 20.5 21 21.5
pH 9.3 8.9 8.6 7.9 7.0 6.7 5.8 5.2 3.9 3.0 2.7
Calculate the content of sodium hydroxide and sodium carbonate in the solution in mg/l.

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