25.0mL of 0.405M Ba(OH)2 (aq) was required to neutralise 27.1mL HCl (aq). What is the molarity of HCl (aq)?

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A: Given,

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A: Given information,     Moles of NH4C2H3O2 = 1.75    Volume of solution = 1.00 L

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Q: what unit should my k constant be？？

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