HCl(aq)+NH3(aq)=NH4Cl(aq)
At the equivalence point, the number of moles of HCl added is equal to the initial number of moles of NH3, because the analyte is completely neutralized.
n(NH3)=c×V=0.0500Lmol×50.0×10−3L=0.0025mol
n(NH3)=n(HCl)
n(HCl)=0.0025mol
c=Vn
∴V=cn=0.125Lmol0.0025mol=0.02L=20.0mL
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