8. When determining the content of citric acid in the preparation, a sample of 10.00 ml was titrated with a 0.1000 M sodium hydroxide solution in a cell with an indicator glass electrode and a silver chloride reference electrode. Calculate the mass of citric acid (C6H8O7) in 100.0 ml of solution based on the results of potentiometric titration:
V(NaOH), ml 8.50 9.00 9.30 9.50 9.70 10.00 10.50
pH 5.80 6.25 6.88 8.05 8.73 9.12 9.47

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