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Common Ions

Common Ions. Calculate the effect of a common ion on pH or solubility. Introduction of a common ion causes salts to become less soluble – think Le Chatelier’s Principle. PbCrO 4  Pb +2 + CrO 4 2- add K 2 CrO 4 - shift left. Calculate the effect of a common ion on pH or solubility.

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Common Ions

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  1. Common Ions

  2. Calculate the effect of a common ion on pH or solubility Introduction of a common ion causes salts to become less soluble – think Le Chatelier’s Principle PbCrO4 Pb+2 + CrO42-add K2CrO4 - shift left

  3. Calculate the effect of a common ion on pH or solubility The pH of a solution can also affect solubility if H+ or OH- can interact with the salt’s ions

  4. Calculate the effect of a common ion on pH or solubility • How will the solubility of calcium carbonate be affected if it is dissolved in a solution of calcium chloride? • presence of Ca2+ ions will shift equilibrium position to left – CaCO3 will be less soluble • How will the solubility of silver phosphate be affected by an decrease in pH? • H+ react with PO43- thus causing a shift right and increasing solubility

  5. Calculate the effect of a common ion on pH or solubility Would magnesium hydroxide (milk of magnesia) be more soluble in an acid or a base? Why? Mg(OH)2(s) Mg2+(aq) + 2 OH-(aq)

  6. Calculate the effect of a common ion on pH or solubility • How will the solubility of magnesium hydroxide be affected by an increase in pH? • more OH- will cause shift left – decrease sol. • How will the solubility of magnesium hydroxide be affected by an decrease in pH? • H+ will react with OH- cause shift right – increase sol.

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