Chemical Combinations By: Shauna, Morgan, and Makenna Experiment Question-What combinations of compounds react chemically? Hypothesis-The Bromothymol Blue will react with Sodium bicarbonate. Dependent Variable-Observations Independent Variable-Reactions Procedure 1) Mix .5 g of sodium bicarbonate with 15 mL of Bromothymol blue. 2) Observe and record. 3) Repeat step 1, but instead mix .5 g of calcium chloride with 15 mL of Bromothymol blue. 4) Mix .5 g of sodium bicarbonate with 15 mL of water. 5) Repeat step 3 with .5 g of calcium chloride and 15 mL of water. 6) Observe and record. Combination Table Combinations Observations CaCl2+C27H28BrO5S •Dissolved •Got foggy at bottom •26.3 degrees C CaCl2+H2O •Temperature increased quickly, then decreased •23.3 degrees C NaHCO3+C27H28BrO5S •White gel/smooth layer at bottom •Different shade of blue at bottom •21.3 degrees C NaHCO3+H2O •Cloudy, then settled •White layer at bottom •20.8 degrees C CaCl2+H20+NaHCO3+C27H28BrO5S •Quickly fizzed •Changed from blue to yellow to white •Fizzing dropped •Bubbled •22.5 degrees C Summary For our experiment, we tested what combinations of compounds would react. We concluded that the compounds Bromothymol blue, calcium chloride, and sodium bicarbonate react by changing colors, fizzing, and temperature changes. In the last combination, we mixed all the compounds all together. The temperature rose and then decreased as did the bubbles in the test tube.