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Qualitative Analysis Lab: Unknown Substance A

623 Words3 Pages

The results of this Qualitative Analysis lab are as follows: Unknown substance A was seen to be soluble in water and didn’t react with phenolphthalein. Sodium hydroxide was then added to it. Substance A formed a white precipitate and had no reaction. The substance was then determined to be magnesium sulfate. The next experiment involved Substance B. Substance B was soluble in water and had no reaction to phenolphthalein. The unknown substance also didn’t have a reaction with sodium hydroxide. Substance B was then tested with Benedict’s solution/heat and turned to a blue color; vinegar was then poured into the substance and had no reaction. Alcohol was then added to the substance and substance B was found to be insoluble. Heat was then added …show more content…

This result showed that the unknown substance had a high melting point, making it identified as sodium chloride. Insoluble substance C was identified by adding two drops of iodine tincture. Substance C turned into a deep blue color in the solution and was then determined to be cornstarch since the blue color indicates if a substance in the solution was cornstarch. Substance D in this experiment was not given but through the report and different testing, substance D would be sodium hydroxide. Substance E would now be the next experiment in the lab.. Substance E was soluble and phenolphthalein was then poured into it; the unknown substance turned into a pink color. The substance has no reaction to sodium hydroxide. The unknown substance was then tested with Benedict’s solution/heat and gave a blue color. Consequently, then ten drops of vinegar were then added into and caused the substance to bubble; from these observations, substance E was deemed sodium bicarbonate. During the experiment the substance F, was found to be soluble in water, and had no reaction to phenolphthalein as well as sodium hydroxide. Unknown substance F was then added with Benedict’s solution/heat and gave a blue color; the substance was then added with vinegar but had no reactions so alcohol was added to

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