If 27.55 mL of 0.101 M barium hydroxide is required to neutralize 25.0 mL of nitrous acid,

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If 27.55 mL of 0.101 M barium hydroxide is required to neutralize 25.0 mL of nitrous acid, what is the molarity of the acid? 

2 HNO2(aq) + Ba(OH)2(aq) → Ba(NO2)2(aq) + 2 H2O(l)

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