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PEKA freezing point

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• 1.
• 2. <ul><li>Problem statement : what is the freezing point of water? </li></ul><ul><li>Hypothesis : the freezing point of water is 0 ˚C </li></ul><ul><li>Variables : </li></ul><ul><li>Manipulated : ice and salt </li></ul><ul><li>Responding : temperature of distilled water </li></ul><ul><li>Constant : time taken </li></ul>AIM : To determine the freezing point of water.
• 3. <ul><li>APPARATUS : </li></ul><ul><li>test tube, beaker, thermometer, stop watch and measuring cylinder. </li></ul><ul><li>MATERIALS : </li></ul><ul><li>Distilled water, ice and common salt </li></ul>
• 4. <ul><li>PROCEDURE : </li></ul><ul><li>Set up the apparatus as shown in diag ram A. </li></ul><ul><li>Record the thermometer readings every 2 minutes until the temperature becomes constant. </li></ul><ul><li>Plot a graph of temperature against time. </li></ul>RESULTS: Thermometer reading for the freezing of water Time (min) 0 2 4 6 8 10 12 Temperature (˚C) 26 15 8 2 0 0 0
• 5. Graph of temperature against time for cooling of water
• 6. <ul><li>DISCUSSION : </li></ul><ul><li>Why was salt added to the ice in the beaker in section A? </li></ul><ul><li>________________________________________________ </li></ul><ul><li>Fill in the following blanks. </li></ul><ul><li>When water freezes, it change from ______ to _____ . The temperature at which water freezes is called the ___________ of water. </li></ul><ul><li>Based on your graph, determine the freezing point of water : ____ </li></ul>To reduce the temperature of the ice to below 0 ˚C liquid solid freezing point 0 ˚C
• 7. <ul><li>CONCLUSION : Is your hypothesis acceptable? </li></ul><ul><li>__________________________________________ </li></ul><ul><li>The temperature of water _____________ when it freezes or boils. The freezing point of water is ___ . </li></ul>remains constant 0 ˚ C yes