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Titration of an acid (20 ml, unknown concentration) with a base (0.1 M) is required up to the equivalence point of 30 ml of the base. Calculate the concentrations of the acid.
Solution: It holds at the same time, equivalence point: n(Base) = n(Säure)
with c=n/V we get:
c(Base)·V(Base) = c(Säure)·V(Säure)
c(Säure) = c(Base)·V(Base)/V(Säure)
c(Säure) = 0.1M · 30ml / 20 ml = 0.15 M = 0.15 mol/l
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