Water Hardness

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Title: Water Hardness

Essay Details:

Subject: Science

Author: Vanessa W

Date: October 13, 2011

Level: University

Grade: B

Length: 2 / 336

Essay text:

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. 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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