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Is citric acid a strong acid?

Updated: 9/17/2023
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9y ago

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No. It is a reasonably weak acid with a pH of around 5. It wouldn't do any harm unless it came in contact with a cut or your eyes...

Added:

  • Citric acid: (1,2,3-tricarboxy-propan-2-ol) 'tricarboxylic hydroxy-propane acid', weak,
  • up to 8% in citric juices.

    (0.005 mol/L for Oranges and grapefruits to 0.30 mol/L in lemons and limes)

    pH in lemons < 2

  • Chemical formula: C6H8O7
  • Molar mass 192.1 g/mol
  • pKa1=3.15

    pKa2=4.77

    pKa3=6.40

Strong acid or base means it ionizes completely in water. It has nothing to do with concentration or corrosiveness. There are seven strong acids:

Sulfuric

Nitric

Hydrochloric

Chloric

Perchloric

Hydrobromic

Hydroiodic

It's easy to remember the list because there are three of the most common industrial acids, three "chloric" acids, three "hydro" acids, and they all make a clumsy "7" on the Periodic Table.

There are dozens of strong bases and hundreds of "almost strong" bases.

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9y ago
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Q: Is citric acid a strong acid?
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