#6 Determination of Ksp of Silver Chromate

#6 Determination of Ksp of Silver Chromate - 4 2-in the...

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Aaron King 660556233 Section 1 March 24, 2008 Determination of Ksp of Silver Chromate 1. In a solution of Ag 2 CrO 4 that is sitting over its undissolved solid, the solution is so saturated that no more of the solid will dissolve. There may be a shifting of ions slightly, but for the most part, the solution will not dissolve any more if the solution is saturated. 2. = . - . y 0 313x 0 056 + . = . y 0 056 0 313x = + . . x y 0 0560 313 = . + . . x 0 297 0 0560 313 = . x 1 13 -= . × - CrO42 1 13 10 9 ++ - Ag2CrO4 2Ag CrO42 =[ +] - Ksp Ag 2CrO42 =[ . × - ] [ . × - ] Ksp 21 13 10 9 2 1 13 10 9 = . × - Ksp 5 77 10 27 3. molar solubility of Ag 2 CrO 4 =[CrO 4 2- ] molar solubility of Ag 2 CrO 4 =1.13x10 -9 4. Because of the common ion effect, the addition of AgNO 3 to Ag 2 CrO 4 will decrease the solubility of Ag 2 CrO 4 if well mixed.
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King 2 5. By using Beer’s Law, it is possible to predict Ksp of an insoluble salt. First, construction of an Absorbance versus Molarity graph must be created to predict the molarity of CrO
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Unformatted text preview: 4 2-in the unknown. By using this concentration, it is possible to predict the Ksp by simple equilibrium equations. The Ksp calculated was 5.77x10-27 , and the molarity solubility of Ag 2 CrO 4 is 1.13x10-9 . With the addition of AgNO 3 , the solubility of Ag 2 CrO 4 is decreased. An error could have occured in the dilutions of the solutions. Also, because our dilution molarities were based on previous dilutions, the smaller the concentration (the more dilutions) the more room for error in the dilutions. Also, the absorbances could have been effected by little smudges or unclean test tubes. By using Beer’s law, it is possible to determine the solubility of an insoluble salt. Also, if a common ion is in the solution, it makes the salt less soluble. This molar solubility can be measured if the amount of common ion is known....
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