Before you come to lab, find the solubility product of silver(I) acetate. The es

Question

Before you come to lab, find the solubility product of silver(I) acetate. The estimate the quantity of silver(l) acetate solution that should consume a known quantity of 0.050 M KCl for each of the four different silver(I) acetate solutions. Take note of the quantity of silver ion solution required to consume the standard KCl solution. This relationship must be used to determine how the subsequent trials will be modified (if necessary). Set up a procedure for each solution so the data collected results in four significant figures, assumes using 5-, 10-, and 25-mL volumetric pipets for dispensing the KCl only, and requires a minimum volume of the saturated silver(I) acetate. For each solution: Determine the volume of standard KCl needed. Determine the theoretical volume of silver(l) acetate required to react with the KCl. Determine volume of silver(l) acetate that you will need to filter for buret rinsing and three trials. In your laboratory notebook, prepare a summary table for the quantities that meet the precision criteria noted above and indicate which volume of KCl you plan to use: Theoretical Ksp = AgC2H3O2(in water) Volume of KCl (for one trial) mL Volume of AgC2H3O2 (for one trial) mL Total volume of AgC2H3O2 mL AgC2H3O2 (in KNO3)

Explanation / Answer

Before you come to lab, find the solubility product of silver(I) acetate. The estimate the quantity of silver(l) acetate solution that should consume a known quantity of 0.050 M KCl for each of the four different silver(I) acetate solutions. Take note of the quantity of silver ion solution required to consume the standard KCl solution. This relationship must be used to determine how the subsequent trials will be modified (if necessary). Set up a procedure for each solution so the data collected results in four significant figures, assumes using 5-, 10-, and 25-mL volumetric pipets for dispensing the KCl only, and requires a minimum volume of the saturated silver(I) acetate. For each solution: Determine the volume of standard KCl needed. Determine the theoretical volume of silver(l) acetate required to react with the KCl. Determine volume of silver(l) acetate that you will need to filter for buret rinsing and three trials. In your laboratory notebook, prepare a summary table for the quantities that meet the precision criteria noted above and indicate which volume of KCl you plan to use:

Theoretical Ksp = AgC2H3O2(in water)

Procedure

clean the 10 ml and 25 ml pipets and buret by soaking up with soap and water , followed by rises with tap water and distilled water . Set up the buret in buret clamp

In order to be certain that the silver acetate solutions are saturated with silver acetate , an excess quantity of solid silver acetate has been added to each solution and this solid must be removed before the solutions are used in the titrations thatfollow

Determination of silver acetate in distilled water

Obtain appx 70 ml of saturated silver acetate in distilled water andfilter it through filter paper to remove any cloudiness /solid , then Rinse the burret with small portions of filtered silver acetate so then fill the burret and record the initial reading to nearest 0.02 ml (recording bottom of meniscus)

Pipet 10 ml of standard 0.0500 M KCl sol in flask .Then add 15 ml of distilled water.

Add appx 1ml of 5% potassium chromate sol. the color is bright lemon yellow

Titrate KCl sol with silver acetate until indicator changes color .record the final liquid level of silver acetate in buret

Repeat determination twice for consistent results

From conc of KCl and from pipet and buret vol calculate the conc in moles /litre of AG+ in saturated sol of silver acetate in distilled water .

Using mean conc of silver ion for three determinations find solubility of silver acetate  

example :   suppose 10 ml of 0.0500 M KCl sol required 12.2 ml of satureted silver acetate sol to reach the Pot chromate end pont ,calculate conc of Ag+ in saturated silver acetate sol and Ksp for silver acetate

sol   In 10.0 ml of 0.0500 M KCl , there are = (0.0100L)(0.0500) mol Cl-)/L KCl sol    = 500*10^-4 mol Cl-

Because silver ions and Cl- ions react in 1:1 ratio , at the end point of titration, no of moles of Ag+ added from buret = no of moles of Cl- in pipet sample

Since the silver ion was contained in vol 12.2 ml, the conc of silver ion =[Ag+ ] = 5.00*10^-4 ml Ag+/0.012222 = 4.10*10^-2 M

The conc of acetate ions will also be 4.10*10^-2 M

so Ksp = [Ag+ ][Ac- ] = 4.10*10^-2 * 4.10*10^-2 = 1.68*10^-3

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