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===Meaning===
[[File:pHScale.png|right|300px|thumb|A '''pH''' scale with the colours of [[Universal Indicator]] at those '''pH''' values and some examples of [[substance]]s at those '''pH''' values.]]
The '''pH''' scale is a scale numbered list from 1 to 14 that is used to identify how [[Acid|acidic]] or [[Base|basic]] a substance is.
===About pH===
: '''pH''' is written with a lower case p and an upper case H and refers to the 'power of Hydrogen' as there are free [[Hydrogen]] [[atomion]]s in an [[acid]].: [[Acid]]s range from 0-6 .9 on the '''pH''' scale with the strongest [[acid]]s being at '''pH''' 0. : [[Base]]s range from 87.1-14 on the '''pH''' scale with the strongest [[base]]s being at '''pH''' 14. Remember [[alkali]]s are a [[base]] [[dissolve]]d in [[water]].: '''pH''' 7 .0 is [[Neutral (Chemistry)|neutral]]. ==Key Stage 4=====Meaning===The '''pH''' scale is a numbered list from 1 to 14 that is used to identify how [[Acid|acidic]] or [[Base|basic]] a substance is. ===About the pH Scale=======Foundation====: The '''pH''' of a [[solution]] is determined by the strength and [[concentration]] of [[Hydrogen Ion|Hydrogen ions]] in an [[acid]] or [[Hydroxide Ion|Hydroxide ions]] in an [[alkali]]. ====Higher=====: In [[acid]]s for a '''pH''' decrease of 1 there must be 10 times greater [[concentration]] of [[Hydrogen Ion|Hydrogen ions]] in [[solution]].