Magnetic Stirrer MS-S LAB

Quick Answer: Magnetic Stirrer MS-S LAB is a stirring-only bench magnetic stirrer listed under the MS-S model code. The MS-S magnetic stirrer is used for dissolving weighed solids and preparing standard and stock solutions at room temperature.

Preparing a Standard Solution with the MS-S

A standard solution is only as accurate as its preparation. The solid, such as anhydrous sodium carbonate for acid titrations, is weighed precisely, dissolved completely in a beaker of distilled water and then transferred with its rinsings into a volumetric flask before making up to the mark. Undissolved crystals carried into the flask, or dissolving later, spoil the concentration.

Stirring the beaker on the MS-S until every crystal has gone makes that middle step reliable and frees the student to prepare the flask and funnel. The stir bar is then lifted out with a retriever and rinsed back into the beaker so that no solution leaves on it. Final mixing is done by inverting the stoppered volumetric flask, not by stirring inside it.

MS-S is the code DLAB uses for its standard stirring-only magnetic stirrer, and the ‘LAB’ in the title appears to be part of the DLAB name. The title lists no heater, so a solid that needs warmth to dissolve should be warmed separately and the solution cooled to room temperature before it is made up.

Keeping Solutions Accurate

• Rinse the stir bar into the beaker with distilled water from a wash bottle before setting it aside.
• Use a separate, clean bar for each solution to avoid cross-contamination.
• Let any solution warmed to dissolve its solid cool before it is made up to volume.
• Wipe the top plate dry after use; salt crystals left there can scratch the next vessel.

Specifications

Solution Work with the MS-S

• Dissolving primary standards such as sodium carbonate or potassium hydrogen phthalate before transfer to a volumetric flask
• Preparing stock salt solutions for class practicals
• Mixing a dilution series for a colorimetry calibration curve
• Dissolving indicators in ethanol and water mixtures at room temperature

Why Choose LabEquip

Stirrers used for standard solutions are bought by chemistry departments and quality-control training labs where students prepare their own titrants. LabEquip lists the MS-S in its General Lab Products range with the glass volumetric flask needed for making up to volume; ask for quantities through the contact page.

Frequently Asked Questions

Should I stir inside the volumetric flask?

No. Dissolve the solid in a beaker on the stirrer, transfer it with rinsings, make up to the mark and mix by inverting the stoppered flask. A stir bar in the neck of a volumetric flask is hard to remove and displaces volume.

How do I know all the solid has dissolved?

Stop stirring briefly and look at the base of the beaker against a dark background. Any remaining crystals will be visible; stir until none are left.

Does the MS-S heat?

The title lists no heating. Some solids dissolve faster in warm water, but a standard solution must be at room temperature when it is made up, so a stirring-only unit suits this job.

Can the stir bar affect the concentration?

Only if solution is lost on it or it carries residue in. Rinse the bar with distilled water back into the beaker before removing it, and make sure it is clean before use.

What is ‘LAB’ in the product name?

It appears to be part of the DLAB brand name, since MS-S is DLAB’s code for a stirring-only magnetic stirrer. It does not indicate a separate model.

Which vessel is suitable for dissolving a primary standard?

A clean borosilicate beaker of about twice the volume of water used, with a stir bar that nearly spans the base. Cover it with a watch glass if the solid is hygroscopic or the room is dusty.

Last Updated: September 2026