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.