Observing a Precipitate-Forming Reaction

Applying Concepts when two clear, colorless solutions are mixed, a chemical reaction may occur, resulting in the formation of a precipitate. 

Materials 150-mL beakers (2) 100-mL graduated cylinder stirring rod (2) spatula (2) weighing paper (2) NaOH Epsom salts (MgS04-7H20) distilled water, balance 

CAUTION Use gloves when working with NaOH. Measure about 4 g NaOH and place it in a 150-mL beaker. Add 50 mL distilled water to the NaOH. Mix with a stirring rod until the NaOH dissolves. 

Slowly pour the Epsom salts solution into the NaOH solution. Record your observations. 

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