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    cannot do this question , please can someone help with an explanation:

    Which of the following solid oxides would not
    lower the pH when added to sodium
    hydroxide solution?

    A Li2O
    B SiO2
    C P4O10
    D Al2O3
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    What pH would 'sodium hydroxide solution' likely have?

    What does 'lower the pH' mean?

    What effect on the pH would each of the four have?
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    SiO2 would not even react i think and Li2O would increase the pH so one of those two are correct. P4O10 and Al2O3 are acidic oxides which would indeed lower the pH. I would go with LiO2 because maybe SiO2 does react with concentrated NaOH.
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    Li2O is basic, so would increase the pH.
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    Li20 is an alkali so will not lower the pH
    Si02 Does not React
    P4010 is acidic and will increase the pH
    Al203 is amphoteric and will act as an acid in this case lowering the pH
 
 
 
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