1.
CuO + 2HCl \(\rightarrow\)CuCl2 + H2O
nCuO=\(\dfrac{16}{80}=0,2\left(mol\right)\)
mHCl=\(300.\dfrac{7,3}{100}=21,9\left(g\right)\)
nHCl=\(\dfrac{21,9}{36,5}=0,6\left(mol\right)\)
Vì 0,4<0,6 nên HCl dư 0,2(mol)
mHCl dư=0,2.36,5=7,3(g)
Theo PTHH ta có:
nCuO=nCuCl2=0,2(mol)
mCuCl2=0,2.135=27(g)
C% dd HCl=\(\dfrac{7,3}{300+16}.100\%=2,3\%\)
C% dd CuCl2 =\(\dfrac{27}{300+16}.100\%=8,54\%\)
NaOH + HCl \(\rightarrow\)NaCl + H2O
mHCl=\(200.\dfrac{7,3}{100}=14,6\left(g\right)\)
nHCl=\(\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
Theo PTHH ta có:
nNaOH=nHCl=nNaCl=0,4(mol)
mNaOH=0,4.40=16(g)
mNaCl=0,4.58,5=23,4(g)
C% NaCl=\(\dfrac{23,4}{200+16}.100\%=10,83\%\)