- The pH scale is used to measure degree of the acidity or alkalinity of an aqueous solution based on the concentration of hydrogen ions.
- pH is defined as the concentration of hydrogen ions in solution.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiX9XQ2IR6mSi9wcQ7g2ikRv13FRQBgG4TMhnt9oCbHX2wohianudZGpeg5rd8hVPmV7nvHfqlJOLvbp3sFiAw5JHGd8UYipMUpGYOfFughG0lpQUFeSbhiYfKuD3f8AQyCjnEnMvLEamk/s400/pH_Scale.jpg)
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- The higher the concentration of H+ , the lower the pH value.
- The higher the pH value, the higher the concentration of hydroxide ions.
- At pH =7, the concentration of H+ ions is equal to the concentration of OH- . The solution is termed as being neutral for example pure water.
- The stronger an acid, the lower of its pH value.
- The stronger an alkali, the higher of its pH value.
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