Adjusting pH of Slurry in H2SO4 to 9.5 with CaO

[Mett]

I have a slurry at pH 2. How much CaO must I add to adjust pH to 9.5
Slurry is in H2SO4 medium

 

[Borek]

pH 2 gives you initial concentration of sulfuric acid, pH 9.5 gives you information about excess CaO that have to be added...

 

[symbolipoint]

Start by calculate concentration of H2SO4 using the given pH, and use simple stoichiometry to find how much CaO; then add some excess until pH 9 (calculating this theoretically I'm not sure). Should be easy in practice.