Lab 11 procedure

# Lab 11 procedure - Enthalpy of Hydration 1 Obtain a sample...

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Enthalpy of Hydration 1. Obtain a sample of anhydrous magnesium sulfate between 7 and 8 grams. Obtain a sample of hydrate that’s between 15.3 and 15.4 grams. Keep the vial of the anhydrous solution closed to avoid absorption of water from the atmosphere. 2. Place 100mL of distilled water in a weighed 10 oz. pressed polystyrene cup. 3. Measure and record temp. vs time data in 30 second intervals for a period of 5 minutes. Quickly transfer the solute sample to the water in the polystyrene cup while stirring with a glass rod. Measure and record the temperature vs time data at one minute intervals for another 15 minutes. 4. Have one partner read the temperature out loud while the other partner records the data. Both
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Unformatted text preview: students should plot a temp. vs Tme graph. Plot the temp in degrees on the y-axis and the Tme in minutes on the x-axis. 5. ±he change in temp. for the dissoluTon of MgSO4 will be between 10 and 12 degrees Celsius and for MgO4 x 7H2O between -3 and -4 degrees Celsius. ±he temp. scale should start a 5 degrees below room temp and extend to 20 degrees above room temp. ±he Tme should read from 0 to 20 minutes. Measure and record the mass of the reacTon mixture. 6. Do at least two determinaTons on the hydrate and one on the anhydrous salt....
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