Chem Pre-Lab 5

Chem Pre-Lab 5 - crystals first appear. PRE-LAB QUESTIONS:...

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03/31/08 Thermodynamics of KNO 3 Dissolving in Water PURPOSE: The purpose of this lab is to measure the solubility of potassium nitrate is water at several temperatures, then calculate the K sp G, H, and S for potassium nitrate dissolving in water. SAFETY: 1. Always wear safety goggles. 2. Handle glassware with care. 3. KNO 3 is an oxidant and an irritant. PROCEDURE: 1. Assemble a hot water bath as shown in Figure 1. Weight 20g of KNO 3 then transfer to test tube. 2. Add 15mL of distilled water and heat test tube in hot water bath. Determine volume of KNO 3 using another test tube. 3. Record temperature when crystals first appear, then add 5 mL of distilled water to the test tube. 4. Remove test tube from hot water bath and allow to cool, then record temperature when
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Unformatted text preview: crystals first appear. PRE-LAB QUESTIONS: 1. The process of KNO 3 dissolving in water should be spontaneous since the KNO 3 is becoming more disorganized and the free energy change should be negative. 2. A saturated solution is when there is un-dissolved solid in equilibrium with its dissolved ions. 3. 4. [Tl] and [Cl] = .01M-K sp = 1.0E-4 T(K) 1/T ln K sp ∆G(J/mol) 293 .00341 2.59-6309 313 .00319 2.92-7600 333 .00300 3.21-8887 353 .00283 3.42-10,037 1. . 0 5 1 . 1 5 2 . 2 5 3 . 3 5 4 . 0 001 . 0 002 . 0 003 . 0 004 /T 1 lnKsp Series 1 2. m= -1444 3. ∆H= 12.01kj/mol 4. ∆S= 62.5 J/mol*K...
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This lab report was uploaded on 04/08/2008 for the course CHEM 202 taught by Professor Cummings during the Spring '08 term at Nevada.

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Chem Pre-Lab 5 - crystals first appear. PRE-LAB QUESTIONS:...

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