pH on lahuses sisalduva vesinikioonide kontsentratsiooni negatiivne logaritm. Taani keemik Søren Sørensen võttis termini „Wasserstoffionenexponent” (vesinikioonide eksponent - pH) kasutusele 1909. aastal. pH omab üksühikuga väärtusskaalat 0 kuni 14. Lahus on neutraalne, kui pH on 7, st et puhas vesi on neutraalne ning lahus on happeline kui pH alla 7, st et mida väiksem number, seda tugevam hape.
A hydrogen exponent, commonly known as pH, is the negative logarithm of the hydrogen ion concentration in a solution. It measures how acidic or basic a liquid is on a scale from 0 to 14. Danish chemist Søren Sørensen introduced the term "Wasserstoffionenexponent" (hydrogen ion exponent) in 1909.
The pH scale ranges from 0 to 14. A solution is neutral if the pH is 7 - meaning pure water is neutral - and acidic if the pH is below 7, where the lower the number, the stronger the acid.
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