Question

after measuring the solid and selecting the appropriate glassware, which of the following options describes the proper steps for dissolving the calcium nitrate? select the single best answer.
○ add calcium nitrate to the glassware. then add a small volume of water to the glassware and swirl to dissolve the calcium nitrate. fill the glassware with water to the 250.0 ml mark. cap the glassware and invert it several times to mix the solution.
○ add water to the glassware and fill it to the 250.0 ml mark. then add calcium nitrate. cap the glassware and invert it several times to mix the solution.
○ add calcium nitrate to the glassware. then fill the glassware with water to the 250.0 ml mark. cap the glassware and invert it several times to mix the solution.
○ add water to the glassware and fill it to the 250.0 ml mark. add calcium nitrate and then stir the solution with a stirring rod to mix.
○ add calcium nitrate to the glassware. add a small volume of water to the glassware and swirl to dissolve the calcium nitrate. fill the glassware with water to the 250.0 ml mark. then stir the solution with a stirring rod to mix.
○ add calcium nitrate to the glassware. then fill the glassware with water to the 250.0 ml mark. stir the solution with a stirring rod to mix

Explanation:

When preparing a solution using a volumetric flask (the appropriate glassware for fixed volume solutions), the correct procedure is to first add the solid solute, then add a small amount of solvent to dissolve it completely before diluting to the mark, and finally invert to mix. This ensures the solute is fully dissolved and the final volume is accurate.

Answer:

Add calcium nitrate to the glassware. Then add a small volume of water to the glassware and swirl to dissolve the calcium nitrate. Fill the glassware with water to the 250.0 mL mark. Cap the glassware and invert it several times to mix the solution.