The reaction of perchloric acid (HClO4) with lithium hydroxide (LiOH) is described by the equation: HClO4 + LiOH → LiClO4 + H2O Suppose 100 mL of perchloric acid is neutralized by exactly 46.9 mL of 0.75 M lithium hydroxide. What is the concentration of the perchloric acid?

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Question:

The reaction of perchloric acid (HClO4) with lithium hydroxide (LiOH) is described by the equation: HClO4 + LiOH → LiClO4 + H2O Suppose 100 mL of perchloric acid is neutralized by exactly 46.9 mL of 0.75 M lithium hydroxide. What is the concentration of the perchloric acid?

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Answer:[HClO₄] = 0.35 MExplanation:Neutralization reaction is:HClO₄ + LiOH  →  LiClO₄  +  H₂OIn this case, we have a titration between a weak acid and a strong base.In chemistry it is also called an acid base equilibrium. HClO₄  +  H₂O  ⇄  ClO₄⁻   +  H₃O⁺       KaThe weak acid is firstly neutralized by the strong base, in order to have a buffer solution before the equivalence point.When we reach the equivalence point, mmoles of acid = mmoles of base and there is a formula to determine it so:M acid . Volume of acid = M base . Volume of baseM acid . 100 mL = 0.75 M . 46.9 mLM acid = (0.75 M . 46.9 mL) / 100 mL → 0.35 M

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