TOML
pH Scale - TOML
The pH scale is a logarithmic measure of hydrogen ion concentration in aqueous solutions. Proposed in 1909 by Danish biochemist S.P.L. Sørensen, it is defined by the formula pH = -log₁₀[H⁺]. A pH of 7 is neutral, 0-6 is acidic, and 8-14 is alkaline (basic). It is widely used in chemistry, biology, agriculture, medicine, and environmental science. As a logarithmic scale where each pH unit represents a tenfold difference in hydrogen ion concentration, a change of 1 pH unit means the acidity or alkalinity changes by a factor of 10.
hydrogen ion concentration
acidity
alkalinity
basicity
chemistry
aqueous solution
logarithmic scale
[[items]]
code = "0"
slug = "ph-0-strongly-acidic"
name = "pH 0 (Strongly Acidic)"
description = "The most strongly acidic pH value."
classification = "Strongly Acidic"
examples = "[{\"name\":\"Hydrochloric Acid (1M)\",\"ph\":\"0.0\"},{\"name\":\"Battery Acid\",\"ph\":\"0.0-1.0\"}]"
phValue = 0
[[items]]
code = "1"
slug = "ph-1-gastric-acid"
name = "pH 1 (Gastric Acid)"
description = "The pH value of human gastric acid."
classification = "Strongly Acidic"
examples = "[{\"name\":\"Gastric Acid\",\"ph\":\"1.0-2.0\"}]"
phValue = 1
[[items]]
code = "2"
slug = "ph-2-lemon-juice"
name = "pH 2 (Lemon Juice)"
description = "The pH value of citrus fruits like lemon juice."
classification = "Acidic"
examples = "[{\"name\":\"Lemon Juice\",\"ph\":\"2.0-2.3\"},{\"name\":\"Vinegar\",\"ph\":\"2.4-3.0\"}]"
phValue = 2
[[items]]
code = "3"
slug = "ph-3-orange-juice"
name = "pH 3 (Orange Juice)"
description = "The pH value of orange juice and soft drinks."
classification = "Acidic"
examples = "[{\"name\":\"Orange Juice\",\"ph\":\"3.0-4.0\"},{\"name\":\"Soft Drinks\",\"ph\":\"2.5-3.5\"}]"
phValue = 3
[[items]]
code = "4"
slug = "ph-4-tomato"
name = "pH 4 (Tomato)"
description = "The pH value of tomatoes and beer."
classification = "Weakly Acidic"
examples = "[{\"name\":\"Tomato\",\"ph\":\"4.0-4.6\"},{\"name\":\"Beer\",\"ph\":\"4.0-5.0\"}]"
phValue = 4
[[items]]
code = "5"
slug = "ph-5-coffee"
name = "pH 5 (Coffee)"
description = "The pH value of black coffee and rainwater."
classification = "Weakly Acidic"
examples = "[{\"name\":\"Black Coffee\",\"ph\":\"5.0\"},{\"name\":\"Rainwater\",\"ph\":\"5.0-5.5\"}]"
phValue = 5
[[items]]
code = "6"
slug = "ph-6-milk"
name = "pH 6 (Milk)"
description = "The pH value of milk and saliva."
classification = "Weakly Acidic"
examples = "[{\"name\":\"Milk\",\"ph\":\"6.5-6.8\"},{\"name\":\"Saliva\",\"ph\":\"6.2-7.4\"}]"
phValue = 6
[[items]]
code = "7"
slug = "ph-7-neutral"
name = "pH 7 (Neutral)"
description = "The pH of pure water, the boundary between acidic and alkaline."
classification = "Neutral"
examples = "[{\"name\":\"Pure Water\",\"ph\":\"7.0\"}]"
phValue = 7
[[items]]
code = "8"
slug = "ph-8-seawater"
name = "pH 8 (Seawater)"
description = "The pH value of seawater."
classification = "Weakly Alkaline"
examples = "[{\"name\":\"Seawater\",\"ph\":\"8.0-8.5\"}]"
phValue = 8
[[items]]
code = "9"
slug = "ph-9-baking-soda"
name = "pH 9 (Baking Soda)"
description = "The pH value of baking soda (sodium bicarbonate)."
classification = "Weakly Alkaline"
examples = "[{\"name\":\"Baking Soda\",\"ph\":\"8.3-9.0\"}]"
phValue = 9
[[items]]
code = "10"
slug = "ph-10-soap"
name = "pH 10 (Soap)"
description = "The pH value of soap and borax."
classification = "Alkaline"
examples = "[{\"name\":\"Soap\",\"ph\":\"9.0-10.0\"},{\"name\":\"Borax\",\"ph\":\"9.0-10.0\"}]"
phValue = 10
[[items]]
code = "11"
slug = "ph-11-ammonia"
name = "pH 11 (Ammonia)"
description = "The pH value of ammonia solution."
classification = "Alkaline"
examples = "[{\"name\":\"Ammonia Solution\",\"ph\":\"11.0\"}]"
phValue = 11
[[items]]
code = "12"
slug = "ph-12-bleach"
name = "pH 12 (Bleach)"
description = "The pH value of household bleach."
classification = "Strongly Alkaline"
examples = "[{\"name\":\"Bleach\",\"ph\":\"12.0-13.0\"}]"
phValue = 12
[[items]]
code = "13"
slug = "ph-13-lye"
name = "pH 13 (Sodium Hydroxide)"
description = "The pH value of sodium hydroxide (lye/caustic soda)."
classification = "Strongly Alkaline"
examples = "[{\"name\":\"Sodium Hydroxide (Lye)\",\"ph\":\"13.0-14.0\"}]"
phValue = 13
[[items]]
code = "14"
slug = "ph-14-strongly-alkaline"
name = "pH 14 (Most Strongly Alkaline)"
description = "The most strongly alkaline pH value."
classification = "Strongly Alkaline"
examples = "[{\"name\":\"Sodium Hydroxide (1M)\",\"ph\":\"14.0\"}]"
phValue = 14