Titration of Calcium HydroxideG
We did this by titrating Hydrochloric Acid into 10 com of Calcium Hydroxide. As we titrated HCI into the Calcium Hydroxide solution, the phenolphthalein's pink shade given to the Calcium Hydroxide slowly became clearer until the complete lack of pink color in the solution of base and acid. My value of 1. 58 g/mol was close to the accepted value of . 59 g/mol with only a 0. 6 + 0. 007% error, which is almost identical to the theoretical value. Because of such a small percentage error, one can attribute the error to random error, and not systematic because of its small value.
Limitation/weakness How much did it affect my result Human error exists even outside uncertainty, where the HCI solution was possibly not correctly stirred along with the Calcium Hydroxide. Because of the fact that this is a titration experiment, the stirring and conglomeration of hydrochloric acid and calcium hydroxide needed to be constant in order for the reaction and correct mount of hydrochloric acid was used to neutralize the basic aspect of calcium hydroxide. Because of the inconsistent stirring, there must have been a small amount of error attributed to this limitation, though it may not look as much.
Possibility: The Calcium Hydroxide solid that did not dissolve into the water may have passed the filter into the actual solution used, causing discrepancies in the data. A second limitation/weakness that may have caused our error is because of the fact that we may not have been careful enough with the filtration of the saturated Calcium Hydroxide. Because the filters themselves may not have been perfect experiment might have taken a wrong turn with solid Calcium Hydroxide within the solution as well, needing a smidgen more Hydrochloric Acid to neutralize it.
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Evaluation of quality of the result: Although there is limitations to our measuring, since we were only able to measure to 2 decimals as a volume, this experiment is still a valid way to figure out the concentration of Calcium Hydroxide with Just the amount and concentration of Hydrochloric Acid, and can be used by other scientists who would theoretically have no idea about how to go about the method of determining the concentration of Calcium Hydroxide. Limitation or weakness Improvement 1 . Human error exists even outside uncertainty, where the HCI solution was possibly not correctly stirred along with the Calcium Hydroxide.
To lower this error and improve this limitation, we could have the same person stir the solution/titration constantly, with more precision and concentration over this mixture, as to get the correct amount of HCI needed to neutralize the solution without any disagreements over what neutralized means or not. With two people concentrated over specific tasks, the uncertainty would also become much smaller as well due to less error attributed to our mistakes. 2. Possibility: The Calcium Hydroxide old that did not dissolve into the water may have passed the filter into the actual solution used, causing discrepancies in the data.
One of the biggest improvements we could make is that we could, this time around, not add such a large amount of Calcium Hydroxide powder into water blindly, as had been done before, so that we would be able to have more saturated water to work with, as opposed to what we had to work with at that moment when the experiment was done. By doing that, we would be able to reduce uncertainty that may have come along with the solid Calcium Hydroxide mixed in with the saturated solution.
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