pH Level Identifier
pH Value (0–14)
The pH scale (0–14) measures acidity and alkalinity. pH 7 is neutral; below 7 is acidic; above 7 is alkaline. Each unit change represents a 10-fold difference in hydrogen ion concentration.
- 1pH 0: most acidic (1 M H⁺)
- 2pH 14: most alkaline (1 M OH⁻)
- 3pH 4 has 1,000× more H⁺ than pH 7
- 4Human blood tightly regulated at pH 7.35–7.45
Compare pH 4 vs pH 7=10^(7−4) = 1,000× more acidic at pH 4
| pH | Example | Category |
|---|---|---|
| 0–1 | Battery acid | Extreme acid |
| 2–3 | Vinegar, lemon juice | Strongly acidic |
| 5–6 | Coffee, rain water | Mildly acidic |
| 7 | Pure water | Neutral |
| 8–9 | Seawater, baking soda | Mildly basic |
| 11–13 | Bleach, ammonia | Strongly basic |
References
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