giúp e vs help me??

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nsa.36

a,CrCl3 + 3NaOH ---> Cr(OH)3 + 3NaCl
Cr3+ + 3 OH- ---> Cr(OH)3
b,FeCl3 + 3NaOH ---> Fe(Oh)3 + 3NaCl
Fe3+ + 3OH- ---> Fe(OH)3
c,NiCl2 + 2KOH ---> Ni(OH)2 + 2KCl
Ni2+ + 2OH- ---> Ni(OH)2
d,Ba(OH)2 + Na2CO3 ---> BaCO3 + 2NaOH
ba2+ + CO3 2- ---> BaCO3
e,HCl + NaOH ---> NaCl +H2O
H+ + OH- ---> H2O

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