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    Finding pH from ion concentrations

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    Could you show me how you solved to get pH of each solution:

    Solution A has [H3O+] = 7.2à?10-5
    Solution B has [H3O+] = 7.2à?10-4
    Solution C has [OH-] = 3.0à?10-11
    Solution D has [OH-] = 6.5à?10-11

    (i) Which solution has the highest pH?
    (ii) Which solution is the least acidic?
    (iii) Which solution is the most acidic?
    (iv) Which solution has the lowest pH?

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    Solution Preview

    According to Arrhenious concept, an acid is defined as a substance that dissociates in water to give H+ (or H3O+) ions.
    <br>for example,
    <br>HCl + H2O -> H3O+ + Cl-
    <br>A base is a substance that contains OH- ions or dissolves in water to produce OH- ions.
    <br>For example,
    <br>NH3 + H2O -> NH4+ + OH-
    <br>The strength of an acid is a measure of the H+ ion ...

    Solution Summary

    The solution gives not only the answers but also the steps required to arrive at the answer. No mathematical step was avoided in the derivation.