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CHEM 121 LAB REPORT 2026 LAB TECHNIQUES AND ANALYSIS MASTER REVIEW

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CHEM 121 LAB REPORT 2026 LAB TECHNIQUES AND ANALYSIS MASTER REVIEW

Institution
Chem
Course
Chem

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CHEM 121 LAB REPORT 2026 LAB
TECHNIQUES AND ANALYSIS MASTER
REVIEW


◉Why will aqueous ions adsorb to the surface of the precipitate.
Answer: Electrostatic attraction (Remove them to not add to weight)


◉Mass of sulfate ion. Answer: Mass of BaSO4 x molar mass of sulfate
ion/molar mass of BaSO4


◉% sulfate ion. Answer: (Mass of sulfate ion/mass of sample) x 100


◉Gravimetric factor. Answer: The ratio of molar masses


◉How to estimate the uncertain figure. Answer: Based on
graduations of the measuring device


◉Experimental error. Answer: Uncertainty in measurements due to
various factors


◉Standard deviation. Answer: The measure associated with the
uncertainty of the lab procedure
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