In part B of this experiment, the copper (II) hydroxide should be made by doing the reaction on a hot stir plate.

Question

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The question asks about the procedure in part B for making copper(II) hydroxide and whether it should be performed on a hot stir plate.
Option 1: True. This would claim that the precipitation or formation of Cu(OH)2 requires heating on a hot stir plate. In general, copper(II) hydroxide is sensitive to heat and can decompose to copper(II) oxide (CuO) when heated strongly. Therefore, conducting the reaction on a hot plate could lead to partial or complete conversion to CuO rather than the desired Cu(OH)2, and would not be the standard or advised approach. The use of a hot plate is typically avoided for this precipitation to prevent unwanted side reactions and loss of the target compound.
Option 2: False. If the protocol specifies performing the reaction in a non-heated environment (for example, at room temperature or with gentle stirring without heating), this would preserve Cu(OH)2 and prevent its decomposition. Heating is not required to form the precipitate and could jeopardize the product by dehydrate/ decompose pathways. Stirring at ambient temperature helps control nucleation and growth of the hydroxide precipitate while maintaining its desired composition.
Overall, the reasoning hinges on the known behavior of copper(II) hydroxide under heat and the typical laboratory practice of forming a stable precipitate without applying heat, which makes heating on a hot stir plate inappropriate in this context.
Note: Safety and experimental details such as reagent concentration, temperature control, and observation of color or turbidity are important for correctly identifying the product and ensuring reproducibility, but the key conceptual point is that Cu(OH)2 is prone to decomposition when heated, so the hot-stirring condition is contraindicated.

CHEM 105-A09C Prelab 6 Copper

In part B of this experiment, the copper (II) hydroxide should be made by doing the reaction on a hot stir plate.

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