Respuesta :
• CaF2+H2SO4-->CaSO4+HF
R: CaF2+H2SO4-->CaSO4+2HF
• FeCl3+NH4OH--->Fe(OH)3+NH4Cl
R: FeCl3+3NH4OH--->Fe(OH)3+3NH4Cl
• Na2SO4+BaCl2--->BaSO4+NaCl
R: Na2SO4+BaCl2--->BaSO4+2NaCl
•Al(NO3)3+H2SO4-->HNO3+Al2(SO4)3
R: 2Al(NO3)3+3H2SO4-->6HNO3+Al2(SO4)3