CH 118 solubility product constants

CH 118 solubility product constants - Solubility Product...

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Solubility Product Constants I. Summary of Results A series of dilutions of A(NO 3 ) 2 was made from 0.4 M stock solution. A similar series of dilutions was made from 0.4 M K 2 X. The same concentrations of A(NO 3 ) 2 and K 2 X were mixed in a well plate and the reaction was noted. If a cloudy precipitate formed, then two lower concentrations were mixed. This process was continued until a reaction did not yield a precipitate. This process was repeated using B(NO 3 ) 2 and KY. The formula for the Ksp of AX is [A + ][B - ]. The formula for the Ksp of BY 2 is [B 2+ ][Y - ] 2 . The Q in the last reaction that yielded a precipitate and the first one that did not yield a precipitate were calculated and averaged to approximate the Ksp. The Ksp for AX was determined to be approximately 6.25 x 10 -3 . The Ksp for BY 2 was determined to be approximately 5.63 x 10 -4 . II. Stoichiometry and Ksp It is not reasonable to compare the solubility of the two salts, AX and BY 2 by simply comparing the solubility product constant because they have different stoichiometries. AX
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