$\text{ The mixture of }1\text{ mole }Ba{F}_2\text{ and }2\text{ moles }{H}_{2}S{O}_4\text{ can be neutralized by }$

${\mathrm{BaF}}_2+2{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{BaSO}}_4+2\mathrm{HF}+{\mathrm{H}}_2{\mathrm{SO}}_4$

One mole of Ca(OH)₂ requires to neutralize HF
one mole of Ca(OH)₂  requires to neutralize H₂SO₄

$\mathrm{Ca}{\left(\mathrm{OH}\right)}_2+2\mathrm{HF}\to {\mathrm{CaF}}_2+2{\mathrm{H}}_2\mathrm{O}$

$\mathrm{Ca}{\left(\mathrm{OH}\right)}_2+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{CaSO}}_4+2{\mathrm{H}}_2\mathrm{O}$