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Homework Help: What happen if two particles (different IEP) are mixed.

  1. Oct 9, 2012 #1
    1. The problem statement, all variables and given/known data
    Suspension of Al2O3 particles and SiO2 particles are prepared seperately at a pH=6. If the two suspensions are mixed, what happen in view of the colloidal stability?

    2. Relevant equations

    3. The attempt at a solution
    Since the isoelectric point (IEP) of alumina and silica is pH 8-9 and 2-3 respectively, the pH 6 is the middle of their point. The alumina is under IEP, so it will have a positive charge. On the other hand the silica is above the IEP, so it will have a negative charge. If they are mixed, it will be flocculated because of unlikely charges. Am I right? If yes, can I say more?

  2. jcsd
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