Determining The K Of Calcium Hydroxide Watch The Following Video Https Www Youtube Com Watch V Pyfopszhc74 Complet 1 (46.05 KiB) Viewed 64 times
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+ Determining the K. of Calcium Hydroxide Watch the following video: Complete the data table and answer the questions in the data analysis. Calcium hydroxide is an ionic solid that is sparingly soluble in water. A saturated, aqueous, solution of Ca(OH), is represented in equation form as shown below. Ca(OH)2 (s) ++ Ca2+ (32) +20H- (89) The solubility product expression describes, in mathematical terms, the equilibrium that is established between the solid substance and its dissolved ions in an aqueous system. The equilibrium expression for calcium hydroxide is shown below. Ka - [C21OH The constant that illustrates a substance's solubility in water is called the Bw. All compounds, even the highly soluble sodium chloride, have a ko. However, the Bar of a compound is commonly considered only in cases where the compound is very slightly soluble and the amount of dissolved ions is not simple to measure. Your primary objective in this experiment is to test a saturated solution of calcium hydroxide and use your observations and measurements to calculate the Bin of the compound. You will do this by titrating the prepared Ca(OH)2 solution with a standard hydrochloric acid solution. By determining the molar concentration of dissolved hydroxide ions in the saturated Ca(OH)2 solution, you will have the necessary information to calculate the in
Data Table Volume of Ca(OH) 15.0 ml 15.0 ml Concentration of HCI 0.05 mol/L 0.05 mol/L 125 120 Initial pH TRIAL #1 TRIAL #2 1. Equivalence point 7.00 ml 7.50 ml 2. Volume of HCl added at the equivalence point 7.00 mL 7.50 ml 3. Moles HCI mol mol 4. Moles of OH (moles OH-moles H') mol mol 5. Moles of Cansions Hint: 1 mol Cat 2 mol OH mol mol 6. Ksr expression for Ca(OH)2 7. Kar for Ca(OH), 8. Kar from Appendix C 6.5 x 10- 6.5 x 10
Data Analysis 1. Calculate the [OH) from the results of your titrations. Explain your calculations: Hint: moles of OH/0.015 L 2. Using stoichiometry, calculate the (Ca?). Explain you calculations Hint: moles of Ca?"/0.015 L 3. Calculate the K for calcium hydroxide. Explain your calculations
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