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Asked by aiishii to Dalya, Derek, Sarah, Tim, Tom on 15 Jun 2011.
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Sarah Thomas answered on 15 Jun 2011:
Haha! Are you testing us?!
pH is a measure of the acidity/basicity of an aqueous solution. Pure water is pH 7. You can think of H2O as being a mixture of H+ ions and OH- ions. At pH 7 these are equally balanced and the overall solution is said to be neutral. At lower pH, the solution becomes more acidic and this means that there is a greater number of H+ ion. At higher pH, the solution becomes from alkaline (basic) and this means that there is a greater number of OH- ions.
An example of an acid is hydrochloric acid which has a chemical formula HCl. In an aqueous solution, the ions that are formed are H+ and Cl- … hence why it is acidic. An example of an alkali is sodium hydroxide which has a chemical formula NaOH. In an aqueous solution, the ions that are formed are Na+ and OH- … hence why it is alkaline.
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Derek McKay-Bukowski answered on 15 Jun 2011:
In water, you can have an excess of H+ or OH- ions. If there are more H+, then it is an acid, if there are more OH-, then it’s an alkali.
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Tom Crick answered on 15 Jun 2011:
The pH scale is a measure of the acidity or basicity of an aqueous solution. Pure water is said to be neutral, with a pH close to 7.0 at 25°C (77°F).
Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline.
An acid is a substance which can act as a proton donor i.e. gives up H+ ions. A base (or alkaline) substance accepts hydrogen ions or more generally, donates electron pairs.
Generally, when an acid and a base combine, you get a neutralisation reaction:
acid + base → salt + water
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Comments
libya4life commented on :
thx .. good information there .. tim ,i see you like facebook .. well i do 2 .. hii5
aiishii commented on :
Thanks