4. Raw Data 0.0275 0.051 0.071 0.0525 0.093 ∆ mass (±0.05 grams) Trials #g pH value Time (hours) Mass before (±0.05 grams) Mass after (±0.05 grams) 1 0.27 26 2.44 2.3470 5 0.68 26 2.15 2.0975 3 0.83 26 2.29 2.2190 4 0.94 26 2.34 2.3910 2 6.28 26 2.13 2.1025 168 hrs 168 hrs Time (hours) 0.8290 grams 2.13 grams 6.28 Apple 2 (water) 1.4705 grams 2.44 grams 0.27 Apple 1 (acid) Mass After (±0.05g) Mass Before (±0.05g) pH value
1. Use distilled water (50mL) into a beaker and record its pH value by measuring it with a pH value indicator. Label this beaker � A � . 2. Now mix distilled water (50mL) and sulphuric acid (10mL) into another beaker. Use the pH value testing paper to make sure the pH value is 2. Label this beaker � B � . 3. Now mix distilled water (50mL) and sulphuric acid (20mL) into another beaker. Use the pH value testing paper to make sure the pH value is 3. Label this beaker � C � . 4. Cut two wood pieces and make each mass to 5g. Check the masses with electronic balance. 5. Place a wood piece into each beaker. Start the timer. Remember to place both beakers near the window or some place that allows them to be exposed to sunlight and oxygen. Try to make them close to each other. And once the beaker is settled, do not change location of any beaker. 6. Leave both beakers alone for 3 hours, and make observation notes on both beakers over time. 7. After 3 hours, take out the wood pieces from each beaker at the same time. Make sure it is on time. 8. Measure each wood pieces with the same electronic balance used before. Record and keep the mass with your observations during the past three hours. 9. Now repeat step 2, but now mix 30mL of sulphuric acid with distilled water (pH value should be 4), and label this beaker � D � . 10. Repeat step 3, but now mix 40mL of sulphuric acid with distilled water (pH value should be 5), and label this beaker � E � . 11. Now repeat 4~8 steps to get another set of mass data and observations.
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