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PH
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: An [[acid]] will have a greater [[concentration]] of [[Hydrogen Ion (Chemistry)|Hydrogen ions]] the lower on the '''pH''' scale.
: An [[alkali]] will have a greater [[concentration]] of [[Hydroxide Ion (Chemistry)|Hydroxide ions]] the higher on the '''pH''' scale.
: A [[Neutral (Chemistry)|neutral]] [[solution]] or [[pure]] [[water]] will have an equal [[concentration]] of [[Hydrogen Ion (Chemistry)|Hydrogen ions]] and [[Hydroxide Ion (Chemistry)|Hydroxide ions]] and have a '''pH''' of 7.
==Key Stage 4 Higher==
: An [[acid]] will have a greater [[concentration]] of [[Hydrogen Ion (Chemistry)|Hydrogen ions]] the lower on the '''pH''' scale.
: An [[alkali]] will have a greater [[concentration]] of [[Hydroxide Ion (Chemistry)|Hydroxide ions]] the higher on the '''pH''' scale.
: A [[Neutral (Chemistry)|neutral]] [[solution]] or [[pure]] [[water]] will have an equal [[concentration]] of [[Hydrogen Ion (Chemistry)|Hydrogen ions]] and [[Hydroxide Ion (Chemistry)|Hydroxide ions]] and have a '''pH''' of 7.
: In [[acid]]s for a '''pH''' decrease of 1 there must be 10 times greater [[concentration]] of [[Hydrogen Ion (Chemistry)|Hydrogen ions]] in [[solution]].