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Chem 2 Lab Common Ion effect

Chem 2 Lab Common Ion effect - flask 10 mL of the Ca(IO3)2...

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CHEM 113 Common Ion Effect
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PURPOSE The purpose of this experiment is to determine the Ksp (solubility product constant) for Ca(IO3)2 * x H20. A solution of iodate will be dissolved in a saturated solution of calcium iodate hydrate and another solution with calcium iodate hydrate and the addition of KIO3. With this experiment, [IO3-] and [Ca2+] can be determined. With this information the solubility product constant can be calculated. Also an understanding of Ksp will be achieved. A reduction in solubility will be noticed in these experiments which are referred to as the “Common Ion Effect”. PROCEDURES There are a total of two parts to this experiment that are almost identical. First, put about 35 mL of 1.00 M into a beaker making sure to label it. Then set up a buret with the Na2S2O3 standard solution and record the initial buret reading in the table. Take a 400mL beaker and place around 300 mL of the 00.24 M KI solution in it. With a 250mL Erlenmeyer flask, add 50mL of KI obtained in the previous step using a graduated cylinder. Add to the
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Unformatted text preview: flask 10 mL of the Ca(IO3)2 solution using a volumetric pipette. Then add 10 mL of 1.00 M HCL to the Ca(IO3)2 and KI to the flask by using a 10 mL graduated cylinder. After all the components are added, the solution color should be brown. Then titrate with the Na2S2O3 until a yellow color change is noticed. At this point, 10 drops of 1% starch indicator should be added and then return to titrating the solution until it is colorless. Record the final buret reading and then repeat the titration 4-6 more times. This would require the Erlenmeyer flask to be prepared again and the steps involved in the titration to be repeated. This should conclude the first part. For the 2 nd part repeat the same procedure, but use (calcium iodate in KIO3) instead making sure to record all the necessary data. OBSERVATIONS, RESULT, AND DATA SHEETS Calculations Questions Conclusions...
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