Markdown
pH Scale - Markdown
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
| code | slug | name | description | classification | examples | phValue |
| --- | --- | --- | --- | --- | --- | --- |
| 0 | ph-0-strongly-acidic | pH 0 (Strongly Acidic) | The most strongly acidic pH value. | Strongly Acidic | [{"name":"Hydrochloric Acid (1M)","ph":"0.0"},{"name":"Battery Acid","ph":"0.0-1.0"}] | 0 |
| 1 | ph-1-gastric-acid | pH 1 (Gastric Acid) | The pH value of human gastric acid. | Strongly Acidic | [{"name":"Gastric Acid","ph":"1.0-2.0"}] | 1 |
| 2 | ph-2-lemon-juice | pH 2 (Lemon Juice) | The pH value of citrus fruits like lemon juice. | Acidic | [{"name":"Lemon Juice","ph":"2.0-2.3"},{"name":"Vinegar","ph":"2.4-3.0"}] | 2 |
| 3 | ph-3-orange-juice | pH 3 (Orange Juice) | The pH value of orange juice and soft drinks. | Acidic | [{"name":"Orange Juice","ph":"3.0-4.0"},{"name":"Soft Drinks","ph":"2.5-3.5"}] | 3 |
| 4 | ph-4-tomato | pH 4 (Tomato) | The pH value of tomatoes and beer. | Weakly Acidic | [{"name":"Tomato","ph":"4.0-4.6"},{"name":"Beer","ph":"4.0-5.0"}] | 4 |
| 5 | ph-5-coffee | pH 5 (Coffee) | The pH value of black coffee and rainwater. | Weakly Acidic | [{"name":"Black Coffee","ph":"5.0"},{"name":"Rainwater","ph":"5.0-5.5"}] | 5 |
| 6 | ph-6-milk | pH 6 (Milk) | The pH value of milk and saliva. | Weakly Acidic | [{"name":"Milk","ph":"6.5-6.8"},{"name":"Saliva","ph":"6.2-7.4"}] | 6 |
| 7 | ph-7-neutral | pH 7 (Neutral) | The pH of pure water, the boundary between acidic and alkaline. | Neutral | [{"name":"Pure Water","ph":"7.0"}] | 7 |
| 8 | ph-8-seawater | pH 8 (Seawater) | The pH value of seawater. | Weakly Alkaline | [{"name":"Seawater","ph":"8.0-8.5"}] | 8 |
| 9 | ph-9-baking-soda | pH 9 (Baking Soda) | The pH value of baking soda (sodium bicarbonate). | Weakly Alkaline | [{"name":"Baking Soda","ph":"8.3-9.0"}] | 9 |
| 10 | ph-10-soap | pH 10 (Soap) | The pH value of soap and borax. | Alkaline | [{"name":"Soap","ph":"9.0-10.0"},{"name":"Borax","ph":"9.0-10.0"}] | 10 |
| 11 | ph-11-ammonia | pH 11 (Ammonia) | The pH value of ammonia solution. | Alkaline | [{"name":"Ammonia Solution","ph":"11.0"}] | 11 |
| 12 | ph-12-bleach | pH 12 (Bleach) | The pH value of household bleach. | Strongly Alkaline | [{"name":"Bleach","ph":"12.0-13.0"}] | 12 |
| 13 | ph-13-lye | pH 13 (Sodium Hydroxide) | The pH value of sodium hydroxide (lye/caustic soda). | Strongly Alkaline | [{"name":"Sodium Hydroxide (Lye)","ph":"13.0-14.0"}] | 13 |
| 14 | ph-14-strongly-alkaline | pH 14 (Most Strongly Alkaline) | The most strongly alkaline pH value. | Strongly Alkaline | [{"name":"Sodium Hydroxide (1M)","ph":"14.0"}] | 14 |