Why do citrus fruits taste sour?
Show answer & explanation
Answer: Citric acid lowers pH
Citric acid lowers pH ✓ — Correct! Citrus fruits contain high levels of citric acid (typically 5-8% in lemons). When you eat them, citric acid molecules release hydrogen ions (H+), lowering pH. Your tongue's sour taste receptors detect these hydrogen ions and signal 'sour' to your brain. Citric acid also acts as a natural preservative and antioxidant. Ripe citrus still tastes sour even with high sugar because acid dominates!
Unripe fruits lack sugar — Wrong. While unripe fruits are more sour due to less sugar, even ripe citrus fruits taste sour because they naturally contain high citric acid levels. The sourness comes from acid, not just lack of sugar. Oranges have both sugar and acid.
Essential oils are bitter — Wrong. important oils in citrus peels can taste bitter, not sour. The sour taste of the fruit flesh comes specifically from citric acid. Bitterness and sourness are detected by different taste receptors on your tongue.
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