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iris [78.8K]
3 years ago
15

Which molecule will form a solution with a very low pH? H3PO4 H2O NaOH KOH

Chemistry
2 answers:
Bond [772]3 years ago
6 0

Answer: Option (a) is the correct answer.

Explanation:

A solution which has more number of hydrogen ions will be acidic in nature and its pH will be less than 7. Whereas a solution which has more number of hydroxide ions will be basic in nature and thus, its pH will be greater than 7.

Also,        pH = -log \frac{1}{H^{+}}

Therefore, a low pH means pH will be very less than 7.

The given molecules will dissociate as follows.

      H_{3}PO_{4} \rightleftharpoons 3H^{+} + PO^{3-}_{4}

H_{2}O being a neutral molecule will not dissociate and pH of water is 7. Hence, it is a neutral molecule.

      NaOH \rightleftharpoons Na^{+} + OH^{-}

      KOH \rightleftharpoons K^{+} + OH^{-}

So, we can see that H_{3}PO_{4} gives maximum number of hydrogen ions. Therefore, we can conclude that molecule of H_{3}PO_{4} will form a solution with a very low pH.

Bess [88]3 years ago
4 0
The correct answer is A: H3PO4
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