Answer to Question #91281 in General Chemistry for Morgan Washington

Question #91281
what volume of 0.125 M HCL is needed to titrate 50.0 ML of 0.0500 M NH3 solution. ML
1
Expert's answer
2019-07-01T03:54:33-0400
HCl(aq)+NH3(aq)=NH4Cl(aq)HCl(aq) + NH_3 (aq) = NH_4Cl(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=0.0500molL×50.0×103L=0.0025moln(NH_3)=c\times V = 0.0500 \frac{mol}{L} \times 50.0\times 10^{-3} L = 0.0025 mol

n(NH3)=n(HCl)n(NH_3) = n(HCl)

n(HCl)=0.0025moln(HCl) = 0.0025 mol

c=nVc = \frac{n}{V}

V=nc=0.0025mol0.125molL=0.02L=20.0mL\therefore V = \frac{n}{c} = \frac {0.0025 mol}{0.125\frac{mol}{L}}= 0.02 L = 20.0 mL



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