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The exact volumes of 1M NaOH solution required to neutralise 50 mL of 1M H₃PO₃ solution and 100 mL of 2M H₃PO₃ solution, respectively, are:
(1). (100 mL and 100 mL)
(2). (100 mL and 50 mL)
(3). (100 mL and 200 mL)
(4). (50 mL and 50 mL)
H₃PO₃ is dibasic. For 50 mL 1M: V(NaOH) = 100 mL. For 100 mL 2M: V(NaOH) = 200 mL.
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