Keq Unk acid

Keq Unk acid - The Ka & Molar Mass of a Monoprotic Weak...

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The Ka & Molar Mass of a Monoprotic Weak Acid Khuong Bui CHM 152 LL 47095 November 03, 2010 Instructor: John Weide Abstract : Weaker acids tend to dissociate less; stronger acids tend to dissociate more. A greater degree of dissociation gives a higher concentration of both conjugate base anion and hydronium cation. Put another way, the stronger the acid, the farther the equilibrium of reaction will lie to the right. The equilibrium constant for the dissociation of a weak acid has a special designation. We call it the acid dissociation constant , and give it the symbol Ka . We write the expression for the acid dissociation constant in terms of the equilibrium concentrations of the products and reactants.
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Unknown : 84 Weight : 0.3093 g Introduction: Thousands of weak acids have been discovered in nature or synthesized in labs. These acid differ in strength over at least 10 orders of magnitude, but they all produce H3O+. Because acid- base chemistry is so important–much industrial chemistry and biochemistry involve acid molecules–chemists have designed easy methods for measuring the hydronium concentration in a sample solution. For a quick, inexpensive, rough estimate of [H3O+], we can use small amounts of indicators ( e.g. phenolphthalein, litmus, methyl red). These molecules are themselves weak acids, and the degree of their dissociation depends on the hydronium concentration of the bulk sample solution. If the undissociated indicator acid molecule and its conjugate base are different colors, we can gauge [H3O+] by monitoring the apparent color of the solution.
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This note was uploaded on 01/26/2012 for the course CHM 152 taught by Professor Mcc during the Spring '11 term at Mesa CC.

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Keq Unk acid - The Ka & Molar Mass of a Monoprotic Weak...

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