Adjusting pH of Slurry in H2SO4 to 9.5 with CaO

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SUMMARY

To adjust the pH of a slurry in H2SO4 from 2 to 9.5, it is essential to calculate the initial concentration of sulfuric acid based on the pH value. The process involves using stoichiometry to determine the required amount of calcium oxide (CaO) to achieve the desired pH level. Additionally, it is recommended to add an excess of CaO to ensure the pH stabilizes around 9. This method is straightforward in practice, although theoretical calculations may introduce uncertainties.

PREREQUISITES
  • Understanding of pH scale and its implications in chemical reactions
  • Basic knowledge of stoichiometry
  • Familiarity with sulfuric acid (H2SO4) properties
  • Experience with calcium oxide (CaO) as a neutralizing agent
NEXT STEPS
  • Calculate the concentration of sulfuric acid (H2SO4) from pH 2
  • Learn stoichiometric calculations for acid-base neutralization
  • Research the effects of excess CaO on pH stabilization
  • Explore practical applications of pH adjustment in industrial processes
USEFUL FOR

Chemical engineers, laboratory technicians, and anyone involved in acid-base chemistry and slurry management will benefit from this discussion.

Mett
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I have a slurry at pH 2. How much CaO must I add to adjust pH to 9.5
Slurry is in H2SO4 medium
 
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pH 2 gives you initial concentration of sulfuric acid, pH 9.5 gives you information about excess CaO that have to be added...
 
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.
 

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