What is pH?
⊗. pH is defined as the negative logarithm of hydrogen ion concentration in a medium.
⊗. For example, if you are saying a solution with pH 6.5, it means that the concentration of H+ ions in that solution expressed in negative logarithmic term is 6.5.
⊗. pH is a scale, a scale to measure the H+ ion concentration in a medium.
⊗. The pH scale starts from 0 to 14. The middle value in the scale (7) is considered as a neutral pH and any solution with pH below 7 is considered as acidic pH.
⊗. Similarly, any solution with pH above 7 is considered as a basic solution.
Why the pH of Water is 7?
⊗. pH of water is 7.
⊗. Like the Celsius temperature scale, the pH scale is also constructed on the basis of water, the universal solvent and also the solvent of life.
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⊗. pH of water is 7 and it is considered as a neutral pH.
⊗. The term neutral does not mean that water does not contain H+ ions.
⊗. In fact the term neutral means water contains equal number of H+ and OH- ions.
⊗. Everyone knows that the pH of water is 7 and it is a neutral pH.
⊗. People often forgot to think why the pH of water is 7; from where the value 7 comes… is it a randomly assigned value to water?
⊗. No, the value 7 is an absolute value derived from the ion product of water.
⊗. The ion product (the product of ions in water i.e., product of H+ and OH-) of water thus forms the basis of pH scale.
⊗. In the next post we discuss the derivation of pH of water from ion product of ionization of water.
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