The correct answer is Vinegar.
Key Points
- The substance that has a pH value lower than 7 is acidic in Nature.
- Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavourings.
- Vinegar typically contains 5–8% acetic acid by volume.
- Usually, acetic acid is produced by the fermentation of ethanol or sugars by acetic acid bacteria.
Additional Information
pH value of some useful substances:
- Common salt - about 7
- Sugar - about 7
- Ethanol - 7.33
- Vinegar - 2.5
- HCl - 3.01
- Milk - 6.5 to 6.7
- Blood - 7.35 to 7.45
