Difference between revisions of "PH"
| Line 2: | Line 2: | ||
===Meaning=== | ===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.]] | [[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.]] | ||
| − | '''pH''' is a | + | 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 pH=== | ===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]] [[ | + | : '''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]] [[ion]]s in an [[acid]]. |
| − | : [[Acid]]s range from 0-6 on the '''pH''' scale with the strongest [[acid]]s being at '''pH''' 0. | + | : [[Acid]]s range from 0-6.9 on the '''pH''' scale with the strongest [[acid]]s being at '''pH''' 0. |
| − | : [[Base]]s range from | + | : [[Base]]s range from 7.1-14 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 is [[Neutral (Chemistry)|neutral]]. | + | : '''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]]. | ||
Revision as of 13:08, 4 January 2019
Contents
Key Stage 3
Meaning
A pH scale with the colours of Universal Indicator at those pH values and some examples of substances at those pH values.
The pH scale is a numbered list from 1 to 14 that is used to identify how acidic or 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 ions in an acid.
- Acids range from 0-6.9 on the pH scale with the strongest acids being at pH 0.
- Bases range from 7.1-14 on the pH scale with the strongest bases being at pH 14. Remember alkalis are a base dissolved in water.
- pH 7.0 is neutral.
Key Stage 4
Meaning
The pH scale is a numbered list from 1 to 14 that is used to identify how acidic or basic a substance is.
About the pH Scale
Foundation
- The pH of a solution is determined by the strength and concentration of Hydrogen ions in an acid or Hydroxide ions in an alkali.
Higher=
- In acids for a pH decrease of 1 there must be 10 times greater concentration of Hydrogen ions in solution.