Transcription of SOLUBILITY AND SOLUBILITY PRODUCT - Instruct
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SOLUBILITY AND SOLUBILITY PRODUCT - Instruct
142 SOLUBILITY AND SOLUBILITY PRODUCT [MH 5; & ] In this section we are going to consider the SOLUBILITY of ionic solidsin water. SOLUBILITY may be considered to be an equilibrium; the equilibriumis between solid and ions in solution. Any ionic solid is 100% ionized in aqueous solution; once it actuallydissolves. The term SOLUBILITY always refers to the amount of solid (either inmoles or grams) that actually does dissolve in solution, producingions; this amount can be calculated for a particular solid. The term SOLUBILITY may also be used in a qualitative sense; there isno magic point above which a salt can be described as soluble , andbelow which a salt can be described as insoluble .Very Soluble - at least mol L 1 dissolves Slightly Soluble - maybe to mol L 1 Insoluble - less than mol L 1 EXAMPLE 1:Bi2S3(s) 2 Bi3+(aq) + 3 S2 (aq)What is the form of the equilibrium constant for this particularequilibrium?
• The solubility of many salts can be increased by the addition of a species that can form a complex ion with one of the ions (usually the cation) formed when a poorly soluble salt dissolves.
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