Editing Heat Of Combustion Of A Candle Lab
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<b>Objective: To determine the heat of combustion of candle wax (cal/g)</b><br> <br> <br> <u>Procedure:</u><br> <br> 1. Hold a lighted match near the base of a candle so that some melted wax falls onto <br> a 3X5 index card. Immediately push the base of a candle into the melted wax. Hold the <br> candle there for a moment to fasten it to the card.<br> <br> 2. Determine the combined mass of the candle and index card. Record the value.<br> <br> 3. Carefully measure (to the nearest milliliter) about 100.ml of chilled water. (The chilled <br> water should be between 10. to 15degree C colder than room temp). Pour the 100.-ml of <br> chilled water into an empty soft-drink can.<br> <br> 4. Using the tab of the soda can, put a glass rod thru the tab and onto an O-ring attached to <br> a stand so the soda can is elevated off the base of the stand. Place the candle on the stand base<br> and change the hieght of the can so that the top of the candlewick is about 2 cm from bottom<br> of the can.<br> <br> 5. Measure and record both the room temperature and the water temperature.<br> <br> 6. Light the candle. Periodically stir the water as it is heated. <br> <br> 7. Continue heating until the temperature rises as far above room temperature as it was below <br> room temperature at the start. (i.e. start at 15degC and room temp is 25deg C so you raise temp to 35degC)<br> <br> 8. When the desired temperature is reached, extinguish the candle flame.<br> <br> 9. Continue stirring the water until its temperature stops rising and record the highest Temp.<br> <br> 10. Determine the mass of the cooled candle and index card including all wax dripping.<br> <br>
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