Question

6. Calcium hydroxide, Ca(OH)2, is slightly soluble in water. The concentration of the hydroxide ion present in a saturated solution was determined at various temperatures by titration with a standardized hydrochloric acid solution, and was collected as follows: Temperature / °C 10 20 30 40 50 [OH"]/mol L- 0.02684 0.02465 0.02276 0.02113 0.01970 a. Write the chemical reaction showing the dissociation of Ca(OH)2 in water. Determine the molar solubility of Ca(OH)2 at 10°C, using an ICE table to assist in this determination. (2 marks) b. Using Excel, create a spreadsheet with the Temperature and [OH") values given above. In a separate column, show the molar solubility values at all measured temperatures. (2 marks) C. Based on the molar solubility values, solve for the Ksp at each temperature. Show a sample calculation at 10°C in your written workings, and add another column to your spreadsheet to report the Ky values at all temperatures. {3 marks) d. Based on the Kop values, calculate 4 Gº at each temperature, bearing in mind that temperatures must be in units of Kelvin for this purpose. Again, show a sample calculation at 10°C in your written workings, and report A.GⓇ values at all temperatures in your spreadsheet. (3 marks) e. Create an XY scatter plot of 4 Gº vs T. And a linear trendline and display the equation on the graph. Remember as always: a proper title; axis labels and units; suitable scaling: significant figures; etc. (3 marks) f. Based on the equation of the trendline, determine the values A.Hand A.Sº, assuming that these values do not change appreciably with temperature. Your trendline equation will follow the form 4,6° = A.Hº - TAS". (2 marks)

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