Solubility Products of Slightly Soluble Hydroxides

Solubility Products of Slightly Soluble Hydroxides - The...

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The Solubility Products of Slightly Soluble Metal Hydroxides Purpose This experiment has two parts. The purpose of the first part of the experiment is to measure the solubility product constant, K sp , for four slightly soluble hydroxides in water. The purpose of the second part of the experiment is to predict the pH of solutions of the hydroxides in the presence of a common ion and to verify your prediction by mixing the solutions and measuring their pH. Introduction Solubility products are the equilibrium constants for the aqueous dissolution of slightly soluble ionic solids into their component ions. Metal hydroxides dissociate into metal ions and hydroxide ions: M(OH) n (s) M n+ (aq) + nOH - (aq) Metal hydroxides, with the exception of alkali metals and select alkaline earths, are only slightly soluble in water. In this experiment, you will explore the solubility of Cu(OH) 2 , Ca(OH) 2 , Mg(OH) 2 , and Ba(OH) 2 . In the first part of the experiment, you will be provided with a saturated solution of each compound. Using a pH probe, you will measure the pH of the saturated solutions and use the information to calculate the hydroxide ion concentration. You will then use the hydroxide ion concentration of each solution to determine the solubility product of the metal hydroxide. In the second part of the experiment, you will use the solubility product that you calculated for each salt to determine the pH of saturated Ca(OH) 2 , Mg(OH) 2 , and Ba(OH) 2 in the presence of a common ion. First, you will calculate the expected pH of each solution after the addition of 20ml of the chloride of each metal to a saturated solution of the metal hydroxide. You will then measure the pH of the solution to verify your results. Chemicals and Equipment
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This note was uploaded on 12/07/2011 for the course CHEM 152 taught by Professor Staff during the Spring '08 term at Pima CC.

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Solubility Products of Slightly Soluble Hydroxides - The...

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