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Essay

Water Hardness

Essay specific features

 

Issue:

Science

 

Written by:

Anthony B

 

Date added:

October 7, 2013

 

Level:

University

 

Grade:

A

 

No of pages / words:

2 / 336

 

Was viewed:

669 times

 

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Essay content:

Distillation has two disadvantages: 1) A large energy input is required and 2) If simple distillation is used, chemical contaminants with boiling points below water (such as ethlyene gycol in automotive antifreeze) will be condensed along with the water. Distillation is most commonly used to remove dissolved minerals and salts from water...
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Distillation is most commonly used to remove dissolved minerals and salts from water. Water hardness can be readily determined by titration with the chelating agent EDTA (ethylenediaminetetraacetic acid). This reagent is a weak acid that can lose four protons on complete neutralization. The four acid sites and the two nitrogen atoms all contain unshared electron pairs, so that a single EDTA ion can form a complex with up to six sites on a given cation...
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