There isn't a specific apparatus specifically designed for dropping solvent onto filter paper. The process itself is quite simple and doesn't typically require specialized equipment.

Here's why:

* Simple technique: Dropping solvent onto filter paper is a common technique used in various contexts, like chromatography or simple filtration.

* No dedicated tool: You can use basic lab tools like a dropper pipette, a burette, or even a syringe to carefully drop the solvent.

* Filter paper as the apparatus: The filter paper itself serves as the primary apparatus, acting as the substrate for the solvent to interact with.

Here are some terms you might encounter related to dropping solvent onto filter paper:

* Spotting: This term is often used in chromatography, where small drops of the sample are applied to a filter paper or TLC plate.

* Chromatographic development: This refers to the process where the solvent moves through the filter paper, separating the components of a mixture.

* Filtration: If you're using the filter paper to separate solids from a liquid, you might refer to it as "filtration" or "gravity filtration."

Examples:

* Chromatography: You would drop small spots of a sample solution onto a filter paper, then develop the chromatogram using a suitable solvent.

* Simple filtration: You might pour a solution containing a solid through a filter paper, allowing the liquid to pass through while retaining the solid on the filter paper.

Instead of a dedicated apparatus, the process is often described by the specific technique or application.