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Hydroxide expirement *Need help by tmr

  1. Nov 2, 2008 #1
    1. The problem statement, all variables and given/known data
    Ok so we did a lab that we combined:
    and 2 non metalic oxides

    each with water and put Phenolphthalein which i understand is colorless in the acidic form and red in basic.

    I got red for CaO, MgO and pink for ZnO and very light pink for Al2O3 and colorless for the non metalic

    Then we added NaOH and HCl to the solutions we got red for all the ones with NaOH and colorless fo all the ones with HCl

    Now the point is to come up with a trend and explain why some are ampiphortic

    3. The attempt at a solution
    ok I figured that wutever was red is a base and wutever colorless is an acid but like how do I prove wuts ampiphortic?

    Wuts the point of adding NaOH and HCL?

    Wut will the reaction be?

    And i think Al and Zn and ampiphortic but i dont know why.
  2. jcsd
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