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Materials Balance (0.01- or 0.001-9 precision) Test tube Bunsen burner Test tube clamp Sodium bicarbonate, 2.008 Spatula Safety Precautions Safety goggles and aprons are required for this lab, Make sure to keep safety goggles on correctly at all times. Also remember not to point the open end of a test tube towards any person Procedure 1. Obtain a small test tube. 2. Measure and record the mass of the test tube. 3. Using a spatula, add approximately 2.00 g of sodium bicarbonate to the bottom of the test tube. 4. Measure and record the combined mass of the test tube and sodium bicarbonate. 5. Light a Bunsen burner and place under the ring stand under the test tube. 6. Heat the test tube for 7 minutes. The solid in the test tube should begin to melt and bubble slightly. You should see droplets of H:0 forming at the mouth of the tube. 7. Quickly remove the test tube from the flame if a white smoke is given off from the open end of the test tube The smoke represents a loss of starting material due to evaporation of molten sodium bicarbonate and will reduce the yield of the product. A small amount of smoke may be inevitable and should not interfere with the accuracy of the results. 8. Using the test tube clamps move the test tube to the table to continue to cool for 5 minutes. 9. When the test tube has cooled to room temperature, measure the combined mass of the test tube and its solid contents. Data Table Mass (grams) Mass of empty test tube Mass of test tube + sodium bicarbonate INITIAL MASS of sodium bicarbonate Mass of test tube + solid product (heating) FINAL MASS of product Appearance of product