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To prepare a standard solution accurately, the correct next step after dissolving the solid in a beaker is to transfer the solution to a volumetric flask and include the rinsings from the beaker. This step ensures that the entire amount of the solute is accounted for when making the standard solution.

When the solution is transferred to a volumetric flask, it is essential to rinse the beaker with distilled water and add those rinsings to the flask as well. This process guarantees that any solute that may adhere to the sides of the beaker is included in the final solution, which is critical for achieving the desired molarity of the standard solution. The volumetric flask is designed to allow for precise volume measurements, enabling the accurate dilution of the solute to a specific final volume.

Using a magnetic stirrer to mix the solution is important for homogeneous mixing, but it is not the immediate next step after dissolving the solid. Allowing the solution to sit for an hour is unnecessary for the preparation process, and adding more solid would potentially change the concentration instead of accurately preparing the standard solution.