Observing chemical changes
Procedure: Refer to lab 3-3C observing changes in matter.
We made some changes such as:
The reactants were strontium chloride and sodium carbonate. We used solid powders on inoculation loop, and the amount of strontium chloride and sodium carbonate changed to 10ml.
Observations:
In order to make our own powder, we poured the two liquids into one beaker. (The two liquids were strontium chloride and sodium carbonate and they mixed together forming a white colored liquid with small particles.) This was the chemical change. We poured this substance through the filter paper which was held by a funnel and ring stand. All the excess liquid went in a beaker which we did not use and the powder was caught onto the filter paper. We used this powder for our experiment.
The powder was a little bit more of a paste since the water hadn’t drained completely. This is what it looked like. it was a white color. I also observed that the smell was not really pleasant. We used the inoculation loop to gather some of our mixture. We moved the mixture slowly across the flame of the Bunsen burner and observed. I inserted a video of this part of our experiment:
As seen in this video, the flame turned orange as the mixture passed through and it was quite bright. The flame wasn’t very large, about four centimeters tall.
We also tested strontium chloride. it was a solid and the consistency was powdery.
This is how the powder looked like. We used the inoculation loop to gather some of the powder. The powder was white. Then, we moved it gently across the flame of the Bunsen burner and observed. I inserted a link to a video we took while doing this experiment.
As seen in the video, our first powder changed the color of the flame, first to deep red and it slowly transitioned to orange. the flame was also quite larger, around five to six centimeters tall.
We experimented with sodium chloride too. it was also solid with a powdery consistency.
As seen in the video, the flame was not nearly as red or large as before. I observed that it was an orange color. This time the flame was only about four centimeters tall.
Conclusion:
While using my results I determined that the chemical change caused the liquids to turn into strontium carbonate and sodium chloride. When pouring the mixture through the filter paper sodium chloride was the solid and the strontium carbonate was liquid. I confirmed this because the flame color for the mixture my group made the flame turn orange, just like the sodium chloride we tested. The strontium carbonate turned red so I know that the powder must’ve been sodium chloride which means the liquid had to be strontium carbonate.