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Lecture 4 part I Chem 102

Lecture 4 part I Chem 102 - Chapter 4 Solution...

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Chapter 4 Solution Stoichiometry Part I
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Solutions Solution is homogeneous mixture of two or more substances. Solute - substance being dissolved Solvent – liquid medium Solubility - ability of one compound to dissolve in another compound ( soluble, slightly soluble and non-soluble ) Saturation point - when no more solute will be accepted by the solvent. water and sugar = syrup sterilized sodium chloride in water = saline
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Solutions • A solution is said to be dilute if there is less of the solute. Adding more solvent to a solution or removing some of the solute is called diluting . • A solution is said to be concentrated if it has more solute. Adding more solute or removing some of the solvent is called concentrating . The concentration (Molarity) of a solution is some measurement of how much solute there is in the solution.
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Water as solvent Can dissolve many different substances. A polar molecule because of its unequal charge distribution. Aqueous solutions (aq)
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Water Molecules and ionic compounds Salt ( + and - Ions) interacts with water = hydration process Ions become hydrated Move independently Solubility depends of attraction of ions and H 2 0 molecules NaCl very soluble AgCl slightly soluble
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Nonionic compounds and Water Ethanol C 2 H 5 OH “ like dissolves like” Polar – polar Nonpolar- nonpolar
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Electrolytes Electrolyte – substance that when dissolved in water produces a solution that can conduct electricity. Strong
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Lecture 4 part I Chem 102 - Chapter 4 Solution...

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