Na2CO3 + BaCl2 -> BaCO3 + 2NaCl
nNa2CO3=\(\dfrac{200.10,6\%}{106}=0,2\left(mol\right)\)
nBaCl2=\(\dfrac{150.20,8\%}{208}=0,15\left(mol\right)\)
Vì 0,15<0,2 nên Na2CO3 dư 0,05 mol
Theo PTHH ta có:
nBaCl2=nBaCO3=0,15(mol)
nNaCl=2nBaCl2=0,3(mol)
mNaCl=58,5.0,3=17,55(g)
mBaCO3=197.0,15=29,55(g)
mdd=200+150-29,55=320,45(g)
mNa2CO3=106.0,05=5,3(g)
C% dd Na2CO3=\(\dfrac{5,3}{320,45}.100\%=1,654\%\)
C% dd NaCl=\(\dfrac{17,55}{320,45}.100\%=5,477\%\)