A 0.9826-g sample containing dimethyl phthalate, C₆H₄(COOCH₃)₂ (194.19 g/mol), and unreactive species was refluxed with 50.00 mL of 0.1104 M NaOH to hydrolyze the ester groups (this process is called saponification).

After the reaction was complete, the excess NaOH was back-titrated with 23.33 mL of 0.1597 M HCl. Calculate the percentage of dimethyl phthalate in the sample.

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C6H4(COOCH3)2 + 2OH →CH4(COO)₂²- + 2CH₂OH