Gravimetric Analysis Lab

1556 Words7 Pages
The goal of the experiment was to identify the unknown compound by investigating both the chemical and physical properties of it. By performing various tests we were able to further discover the properties of our unknown compound. Through process of elimination we were able to rule out potential compounds by comparing our results to our research of other compounds. We determined the quantitative solubility of our compound by dissolving it in water until the solubility capacity was reached. By finding the solubility we were able to make inferences about the formation of a precipitate if our compound was involved in a chemical reaction1. We were able to compare our reading of solubility to online sources, allowing us to eliminate certain compounds that were completely out of range displayed in Table 1. With research we were able to learn that alkali metals are, in fact, soluble and KCl is among this group2. We tested the pH of our unknown compound using pH paper. After being soaked in the solution, the color of the pH paper remained orange, indicating that the pH of our compound is neutral. Considering KCl as the identity of the unknown compound, the pH reading makes sense. Because the potassium portion of the compound comes from such a strong base, and the chloride portion comes from such a strong acid, they cancel out and the compound becomes…show more content…
We created 5 different solutions, 3 were with our unknown compound and the other 2 were with KCl so that we could compare the products of the reactions. We completely dissolved .5g of our compound into 5mL of water, and AgNO3 was used as a precipitating agent and was added until the precipitate stopped forming. We used the gravimetric analysis as a way to gain more quantitative information about our compound and we did this by separating the precipitate that was formed from the solution so that we could then weigh the solid and make
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