Experimental Procedure
Identifying the Unknown We performed three tests on our compound to definitively identify it. First we combined 5 g of our unknown compound with 10 mL of distilled water and measured the pH change in the water to test its solubility. Then, to try to identify the cation present in our compound and narrow down the possibilities, we held a sample over a flame and watched for color change. We performed an acid test where we applied a few drops of HCl and watched for a bubbling reaction, to test for the presence of carbonate.
Confirming the Identity
Now that the test were concluded we made a hypothesis as to the identity of our unknown compound. To verify the unknown compound’s identity, we performed the conductivity test, and the previously mentioned tests on a sample of the hypothesised compound and compared the results.
Synthesizing the Compound
After we had confirmed the identity of the unknown compound, we attempted to synthesize an exact copy of it. Therefore, we added 1.11g of CaCl₂ and 1.06g of NaCO₃ to a beaker filled with 70mL of distilled water. To separate the precipitate from the aqueous solution, we vacuum filtrated the contents of the beaker. Once we determined that the
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The flame test produced inconclusive results because we were unable to determine whether the flame produced a faint orange tint or no color. Next we tested the pH change that the compound caused in water to determine its solubility. Our known compound did not dissociate or dissolve in water, instead it formed a white colored precipitate, therefore that eliminated a lot of the choices from the unknown compound list. In addition, when we performed the acid test, the unknown compound bubble which revealed it must be a carbonate. The previous test reveal it did not dissociate in water, therefore the only option from the list it could be was