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Published byMaurice Alexander Carter Modified over 8 years ago
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Precipitation Analysis Considering the formation of solid from solution. Q vs. Ksp Ion Analysis
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How to predict whether a precipitate will form when two solutions are mixed? Investigate Qsp vs. Ksp at initial concentrations Q = Ksp “Saturated” solution occurs. No changes. Q > Ksp Precipitates will form until saturated. Equilibrium shifts left. Q < Ksp NO precipitate forms. Solid dissolves. Equilibrium shifts right.
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Sample Exercise p. 734 Predict whether precipitate will form? Q > Ksp PPT will form!
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Selective Precipitation Mixtures of metals in solutions are separated using a technique called selective precipitation. Using a reagent whose anion forms a precipitate with only one or a few of the metals in the mixture. Sulfide salts (sulfide ion) is often used!
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Sample Exercise 17.16 p.735
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Qualitative Analysis of Cations Separating mixtures into five major categories based on solubility. #1. Insoluble Chlorides #2. Insoluble sulfides in Acids. #3. Insoluble sulfides in Bases. #4. Insoluble carbonates. #5. Alkali metals and ammonium ions.
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