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## Separating Mixtures | Chemical Earth

Need for Separating Mixtures Often substances we require from the natural world need to be separated from impurities, which is separating mixtures. This can be done through a number of techniques. The techniques presented are based on physical properties and can’t be used to separate compounds into elements. Separating Solids of Different Size Two common...

08 Mar 201608 Jun 2016
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## pH Acidity Acidic Environment

pH Acidity Describing the acidity of a solution using concentrations with negative powers can be cumbersome, so a more convenient approach is to use pH acidity to describe acidity levels. The pH (potential hydrogen) scale is a logarithmic scale that indicates the concentration of hydrogen ions in a solution. The higher the concentration of hydrogen...

06 Mar 201608 Jun 2016
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## Acids Bases Neutral Substances

Acid An acid can be defined as a proton donor and has sour taste. Many acids naturally occur and have known for hundred years. Some foods contain acids, such as vinegar (ethanoic acid), citric acid (2-hydroxypropane-1,2,3-tricarboxylic acid) and ascorbic acid (vitamin C). Hydrochloric acid (HCl) occurs in the stomach to provide an acidic environment for...

01 Dec 201509 Jun 2016
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