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Tham khảo sách 'chemistry part 29, julia burdge,2e (2009)', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | adding AgCl to water and stirring Therefore the concentrations are Neither AgCl nor a saturated solution of AgCl is purple. The color has been used In the resulting saturated solution the concentrations of Ag and CI- are equal and the product of their concentrations 708 1 f After filtering off the solid AgCl we dissolve enough NaCl to make the concentration of Cl - 1.0 M. Because the concentration of CI is now larger the product of Ag and Cl concentrations is no longer equal to 7 sp In any solution saturated with AgCl at 25 C. the product of Ag and Cl-J must equal the sp of AgCl. Therefore AgCl will precipitate until the product of ion concentrations is again 1.6 X 10 I0. Note that this causes nearly all the dissolved AgCl to precipitate. With a Cl- concentration of 1.0 M the highest possible concentration of Ag is 1.6 X 10 10 M. therefore Ag 1.6 X 10 10 M The amount of AgCl precipitated is exaggerated for emphasis. The actual amount of AgCl would be extremely small. What s the point When two salts contain the same ion the ion they both contain is called the common ion. The solubility of a slightly soluble salt such as AgCl can be decreased by the addition of a soluble salt with a common ion. In this example AgCl is precipitated by adding NaCl. AgCl could also be precipitated by adding a soluble salt containing the Ag ion such as AgNO3. 709 710 CHAPTER 17 Acid-Base Equilibria and Solubility Equilibria Sample Problem 17.11 demonstrates the effect of pH on solubility. Think About It When a salt dissociates to give the conjugate base of a weak acid H ions in an acidic solution consume a product base of the dissolution. This drives the equilibrium to the right i more solid dissolves according to Le Chatelier s principle. Which of the following compounds will be more soluble in acidic solution than in water a CuS b AgCl c PbSO4 Strategy For each salt write the dissociation equilibrium equation and determine whether it produces an anion that will react with HT Only an .
