LAB REPORT # 9 SOLUBILITY PRODUCT CONSTANT.docx - Sepulveda...

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Chapter 13 / Exercise 48
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Sepulveda 1 Lorena A. Sepulveda Jonathan Orozco April 18, 2016 DETERMINATION OF THE SOLUBILITY-PRODUCT CONSTANT FOR A SPARINGLY SOLUBLE SALT Abstract The experiment’s principal objective was to become familiar with equilibria involving sparingly soluble substances by determining the value of the solubility-product constant for a sparingly soluble salt. Salts are inorganic substances product of the reaction between an acid and a base in an aqueous solution. A compound is soluble when it dissolves in water; solubility is the quantity of the compound that dissolves in a certain amount of liquid; Ksp is the Solubility- Product Constant and is used to determine the molar solubility of a compound. The Ksp determination is done with the formula Ksp = [Ag + ] 2 [CrO 4 2- ]. First, a calibration curve, concentration vs. absorbance, was prepared using four 100mL solutions with different [CrO 4 2- ] molarities. The absorbance was determined with a spectrophotometer. The second part involved the preparation of three samples of 0.0040M AgNO 3 and 0.0024M K 2 CrO 4 and the measurement of their corresponding absorbance. The readings were equal to 1.762, 1.625, and 1.623; the absorbance was compared with the Calibration Curve of [CrO 4 2- ] vs. absorbance. Their corresponding concentrations were used to determine the Ksp of the three samples. The Ksp obtained were 2.16*10 -10 , 1.91 *10 -10 , and 1.88*10 -10 ; the average of solution Ksp = 1.98*10 -10 . Introduction Inorganic substances are classified in three categories: acid, bases, and salts. According to the Bronsted-Lowry theory, acids are proton donors and bases are proton acceptors. When an acid reacts with a base in aqueous solution, the products are water and an ionic compound called salt. Ionic compounds are soluble or insoluble in water, and to determine the degrees of solubility of these salts the equilibrium concept is applied to the process of dissolution. Thus, the equilibrium constant for a chemical equation representing the dissolution of an ionic compound
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Chapter 13 / Exercise 48
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Sepulveda 2 is the solubility-product constant (Ksp). The molar solubility of a compound can be calculated directly from its Ksp. The purpose of this experiment was the determination of the Solubility- Product constant for a Sparingly Soluble Salt. It was reached in two steps: preparation of a Calibration Curve and determination of the Ksp of the Sparingly Salt through the absorbance.

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