A 5.00 mL sample containing sulphurous acid (Ka1 = 1.5 x 10-2; Ka2 = 1.0 x10-7) is titrated with 0.1324M NaOH. The stoichiometric point is at 25.32 mL. How many g of H2SO3 are present in the sample and what is the pH at the stoichiometric point?
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