Question

after measuring the mass of a solid in a weighing vessel, what are the proper steps to add the solid to a volumetric flask for making a solution?
○ pour the solid from the weighing vessel directly into the flask.
○ pour the solid from the weighing vessel directly into the flask, then rinse the weighing vessel to ensure all residual solid is added to the flask.
○ use a funnel through which the solid is poured into the flask, then rinse the funnel to ensure all residual solid is added to the flask.
○ use a funnel through which the solid is poured into the flask.

Explanation:

To ensure the entire measured mass of the solid is transferred to the volumetric flask (critical for accurate solution concentration), first pour the solid directly from the weighing vessel into the flask, then rinse the weighing vessel and add all the rinsings (containing residual solid) to the flask. This avoids losing any solid that would skew the final solution's concentration.

Answer:

○ Pour the solid from the weighing vessel directly into the flask, then rinse the weighing vessel to ensure all residual solid is added to the flask.