Chem 18.1 Experiment 5 Fwr
Experiment 5
COMMON ION EFFECT
MALUBAY, Justin Damian
PADRILLAN, Hazel Rose
CD2, Group 5 Ms. Sarah Sibug
6 April 2013
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I. ABSTRACT
The common ion effect occurs when a given ion is added to an equilibrium mixture that already contains that ion, and the position of equilibrium shifts away from forming more of it. This paper is a follow-up of the experiment which aims to determine the common-ion effect on the extent of ionization of an electrolyte and the solubility of a slightly soluble substance, and to determine the type of substance with comprise buffer solutions and identify buffer solutions. The significance of the study is to know the effect of adding strong acids or bases to buffer solutions especially that of the body.
Part A determines the effect of common ions to the extent to ionization wherein certain reagents were mixed with water in one test tube and a solution with a common ion in another. Part B determines which solutions exhibit buffer effect wherein certain reagents were mixed and is tested with a pH meter. Part C determines the effect of common ion on the solubility of slightly soluble salts wherein benzoic acid is dissolved in an aqueous solution of sodium benzoate and water.
Common ions suppress the extent of ionization, buffer the solution, and lower the solubility of slightly soluble salts.
Students should however consider not deviating from certain measurements and should thoroughly clean the pH bulb after every solution.
II. KEYWORDS
Common ion, buffer, pH, ionization, solubility
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III. IV. INTRODUCTION V.
The common-ion effect occurs when a given ion is added to an equilibrium mixture that already contains that ion, and the position of equilibrium shifts away from forming more of it. Buffer systems work through common-ion effect. The essential feature of a buffer is that it
COMMON ION EFFECT
MALUBAY, Justin Damian
PADRILLAN, Hazel Rose
CD2, Group 5 Ms. Sarah Sibug
6 April 2013
-------------------------------------------------
-------------------------------------------------
I. ABSTRACT
The common ion effect occurs when a given ion is added to an equilibrium mixture that already contains that ion, and the position of equilibrium shifts away from forming more of it. This paper is a follow-up of the experiment which aims to determine the common-ion effect on the extent of ionization of an electrolyte and the solubility of a slightly soluble substance, and to determine the type of substance with comprise buffer solutions and identify buffer solutions. The significance of the study is to know the effect of adding strong acids or bases to buffer solutions especially that of the body.
Part A determines the effect of common ions to the extent to ionization wherein certain reagents were mixed with water in one test tube and a solution with a common ion in another. Part B determines which solutions exhibit buffer effect wherein certain reagents were mixed and is tested with a pH meter. Part C determines the effect of common ion on the solubility of slightly soluble salts wherein benzoic acid is dissolved in an aqueous solution of sodium benzoate and water.
Common ions suppress the extent of ionization, buffer the solution, and lower the solubility of slightly soluble salts.
Students should however consider not deviating from certain measurements and should thoroughly clean the pH bulb after every solution.
II. KEYWORDS
Common ion, buffer, pH, ionization, solubility
-------------------------------------------------
III. IV. INTRODUCTION V.
The common-ion effect occurs when a given ion is added to an equilibrium mixture that already contains that ion, and the position of equilibrium shifts away from forming more of it. Buffer systems work through common-ion effect. The essential feature of a buffer is that it
References: Silberberg, M., (2009), Chemistry: the molecular nature of matter and change, 5th ed., McGraw-Hill: NY I hereby certify that I have given substantial contribution to this report. _____________________ MALUBAY, Justin Damian _____________________ PADRILLAN, Hazel Rose