Which of the following weak acids would produce more hydronium ion when placed in water?

Question

BlackTom AI · Accepted Answer

To determine which weak acid yields more hydronium ion in water, we compare their acid strengths via Ka values. A larger Ka means the acid dissociates more in solution, producing more H3O+.
Option 1: HNO2 with Ka = 4.5 x 10^-4. This is a moderately weak acid; its Ka is smaller than HF’s, so it will produce fewer hydronium ions than a stronger acid in the list.
Option 2: HF with Ka = 7.2 x 10^-4. This is the largest Ka among the given acids, indicating the greatest extent of dissociation in water among the options, and therefore the highest [H3O+].
Option 3: HC2H3O2 (acetic acid) with Ka = 1.8 x 10^-5. This is significantly weaker than HF, so it yields a much smaller [H3O+], contributing fewer hydronium ions.
Option 4: HCHO2 (formic acid) with Ka = 1.8 x 10^-4. While stronger than acetic acid, it is still weaker than HF in this set, so it produces fewer hydronium ions than HF.
In summary, the strength ordering from strongest to weakest among these acids is HF > HCHO2 > HNO2 > HC2H3O2, which means HF will produce the most hydronium ions in water.

SP25: CHEM-30A Sec 01 - Intro Chem Quiz 6

Which of the following weak acids would produce more hydronium ion when placed in water?

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Question at position 29 What distinguishes a weak acid from a strong acid?Weak acids completely dissociate into ions in solutionWeak acids have higher acidity than strong acidsWeak acids release more hydrogen ions in water than strong acidsWeak acids only partially ionize in water

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