Calamansi has a pH level of 5 while lemon has a pH level of 2. Which of the two is more acidic? Why?
The correct answer and explanation is:
Correct Answer:
Lemon is more acidic than calamansi.
Explanation (300 words):
Acidity is measured on the pH scale, which ranges from 0 to 14. Substances with a pH below 7 are considered acidic, while those above 7 are basic (alkaline). A pH of 7 is neutral, like pure water.
Importantly, the pH scale is logarithmic, not linear. This means that each whole number change in pH represents a tenfold change in acidity. So, a substance with a pH of 2 is ten times more acidic than a substance with a pH of 3, and 1,000 times more acidic than a substance with a pH of 5.
In this case:
- Calamansi has a pH of 5
- Lemon has a pH of 2
To compare their acidities, we can use the difference in pH: 5−2=35 – 2 = 3
This means lemon juice is 10³ = 1,000 times more acidic than calamansi juice.
The higher acidity of lemon is due to its higher concentration of citric acid, a natural compound that gives lemon its sour taste. Calamansi, also known as calamondin, contains both citric and ascorbic acids, but in lower concentrations compared to lemon. As a result, it has a milder sourness and lower acidity.
In practical terms, lemon juice is more likely to cause a sharp sour taste, irritate the stomach lining if consumed in large amounts, or corrode materials more quickly than calamansi juice would. This greater acidity also makes lemon more effective in culinary and cleaning applications where acid strength is important.
Therefore, based on their pH values, lemon is significantly more acidic than calamansi because it has a much lower pH and a higher concentration of hydrogen ions (H⁺).