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Qualitative Analysis Lab: Unknown Substance A

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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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Introduction The purpose of this Lab was to identify the density of the unidentified object and determine what substance the unidentified object given by the teacher was. The density calculated in the experiment will stay the same because the density of the unidentified object will stay constant. The Independent Variable of this experiment was the calculated density and the unidentified object given. The Dependant Variable for this experiment was the density.

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Elodea” was put into a tank labelled “chemically treated Elodea”. Three drops of phenolphthalein were added to each beaker and then all of them were placed on a sheet of white paper. 0.02N NaOH was slowly added to the “tap water with Elodea” beaker with a dropper that delivers 0.025 mL per drop. Each drop was counted and the solution was stirred thoroughly before adding the next drop. This was continued till a faint pink color appeared in the solution.

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