Grade 9 Science Lab

Written by: Nanako Ochi and Jeeyeon (Maria) Choi

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On February 15th, We did an experiment in science lessons. Students were separated into groups. The experiment is ‘what happened if we mix together sodium bicarbonate, calcium chloride, and phenol red.’ Students made their hypothesis of experiment  for the day before. And, students will do the experiment to help each other. Here is our experimental procedure; 

  1. Put about 8.4g(5 ml or 1 teaspoon) of baking soda into a zip lock bag.
  2. Add about 16.9g(10 ml  or 2 teaspoons) of calcium chloride to the same bag.
  3. Mix the two chemicals.
  4. Measure 10 ml of phenol red solution in a medicine measuring cup.
  5. Put the container of phenol red solution into the ziplock bag so the liquid does not spill. Press the air out of the baggie. Seal the ziplock bag.
  6. Tip the vial of phenol red solution. Record the observations.

The results of the experiment showed that the colors turned orange when the sodium bicarbonate (Baking soda), calcium chloride, and phenol red combined together and the gas was generated, causing the bags to swell.

 By this experiment, we were surprised that colour was change to orange and the temperature was become hot also the bags was swelled because of the gas was generated when the sodium bicarbonate (baking soda), calcium chloride, and phenol red combined together. And, we checked the result of this experiment. On February 22nd, we have another experiment that we need to think of the own experiment and hypothesis.

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