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When reacting with water, nonmetal oxides form acids and metal oxides form bases. Which of the following......

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would have a pH>7 when heated in water?

Na2O

H2O

CO2

SiO2

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  1. Na2O + H2O >> 2 NaOH

    NaOH is a stong base so pH > 7

    H2O has pH = 7

    CO2 + H2O >> H2CO3

    H2CO3 is a weak acid and pH is < 7

    SiO2 + H2O >> H2SiO3  

    It is an acid and pH < 7

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