A student must prepare 500.0 mL of solution containing 0.999 grams of solid copp

Question

A student must prepare 500.0 mL of solution containing 0.999 grams of solid copper(ll) sulfate. Which of the following statements are FALSE regarding the proper procedure to prepare this solution? I. The 0.999 grams of solid copper(ll) sulfate is dissolved in a 500.0-mL volumetric flask containing 500.0 mL of water. II. The 0.999 grams of solid copper(ll) sulfate is dissolved in a 500.0-mL volumetric flask containing 400 mL of distilled water before dilution to 500.0-mL. III. The 0.999 grams of solid copper(ll) sulfate is placed in an empty 500.0-mL volumetric flask, diluted to 500.0 mL and allowed to dissolve. a) I and II b) II and III c) I and III d) I, II, and III e) None are false.

Explanation / Answer

Solution I:

this is false, since we can't assure that the 0.999 g of solid + 500 mL will remain 500 mL, note that the final volume is expected to be 500 mL

Solution II:

This is correct, since we end up with 0.999 g of solid AND V = 500 mL final

Solution III:

This is correct, since final volume will be V = 500 mL

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