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23 September, 08:30

Assuming equal concentrations, arrange these solutions by pH.

NH3 (aq)

Sr (OH) 2 (aq)

HBr (aq)

HCN (aq)

KOH (aq)

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Answers (1)
  1. 23 September, 08:42
    0
    Highest pH (most basic)

    Sr (OH) 2 (aq)

    KOH (aq)

    NH3 (aq)

    HF (aq)

    HClO4 (aq)

    Lowest pH (most acidic)

    Explanation:

    The concentration of H + ion will determine the pH of a solution. The pH actually reflects the ratio of H + ion and OH - since both of them can combine into water. Solution with more H + ion will have a lower pH and called acidic, while more OH - will have high pH and be called basic. Strong acid/base will be ionized more than weak acid/base.

    Sr (OH) 2 (aq) = strong base, release 2 OH - ion per mole

    KOH (aq) = Strong base, release 1 OH - per mole

    NH3 (aq) = weak base, release less than 1 OH - per mole

    HF (aq) = strong acid, release 1 H + per mole

    HClO4 (aq) = stronger acid, release 1 H + per mole
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