Chap 4 - Water as a solvent Many of water's properties come...

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Water as a solvent Many of water’s properties come from the fact that it is a polar solvent. Polar compounds are somewhere between ionic and covalent. The atoms share electrons, but one atom gets more than the other In this case, the oxygen is more negative, and the two hydrogens are more positive This means that when an ionic compound gets introduced to water, the oxygen attach to the positive ion and the hydrogens attach to the negative ion. This dissolves the ionic compound. This is known as hydration.
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Nature of solvents Solute- what is getting dissolved Solvent- the thing that is dissolving For the most part, solutes are solids and solvents are liquids Aqueous solutions are solutions where water is the solvent Ionic compounds dissolved in water are known as electrolytes Electrolytes exhibits electrical conductivity
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Strong Electrolytes Three types we’ll be dealing with Strong bases- split into a OH- and a positive ion Strong acids- split into a H+ and a negative ion Soluble salts- split into a negative and positive ion These ions help move electrical currents. Pure water does not conduct electricity The idea that bases have OH- groups and acids have H+ groups is known as the Arrhenius model STRONG means it dissolves completely. So because NaCl is a strong electrolyte, 1 mole of NaCl becomes one mole of Na+ and one mole of Cl-
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This note was uploaded on 04/08/2008 for the course CHEM 112 taught by Professor Jones during the Fall '07 term at Stevens.

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Chap 4 - Water as a solvent Many of water's properties come...

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