How do you clean glass crucibles?

How do you clean glass crucibles?

Soak the crucible in diluted hydrofluoric acid for at least 24 hours and then boil for 3 hours. After cooling, rinse carefully with water and – if necessary – mechanically clean in an ultrasonic bath. Rinse again and finally boil in distilled water to completely remove the hydrofluoric acid.

How do I clean my platinum crucible?

One way of cleaning platinum crucibles is by soaking them in diluted hydrofluoric acid for at least 24 hours, then boiling for three hours. Once the platinum crucible is cool, it should be rinsed carefully with water and then if necessary it should be cleaned mechanically in an ultrasonic bath.

How do I clean my g4 crucible?

Gently wash crucibles in soapy water (Alconox); rinse well with distilled water.

How do you clean zirconium crucibles?

The method is to heat the empty crucible to a temperature of about 500 degrees Fahrenheit and keep it for 20 minutes; then heat the crucible to red heat and stop heating; let the crucible cool slowly, this process will take away any moisture in the crucible.

How are crucibles cleaned?

How do you clean platinum plates?

I would suggest cleaning the platinum Wilhelmy plate with boiling conc. aq. hydrochloric acid (15─20 wt%), which must be free from any oxidizing agent (particularly avoiding nitrate contamination). The plate can be further cleaned, from any possibly adsorbed sulfate contamination that may still resist, with diluted aq.

What is a platinum crucible?

One of the most valuable tools of the analytical chemist is the platinum crucible. Platinum crucibles are commonly used for XRF sample preparation, wet chemistry, ash testing, and Loss on Ignition (LOI) applications. Platinum crucibles are made with just enough strength required for use in the chemical laboratory.

How do you clean a sintered glass funnel?

Carefully add 15ml 30% hydrogen peroxide, or 1/3 the volume of sulfuric acid used, to the Büchner funnel and stand back! Let the reaction proceed for about a minute and then apply a quick vacuum (just enough to pull the solution through the sinter into the flask and the sinter is dry.) Monitor the reaction.

How do you clean glassware in a lab?

Cleaning Laboratory Glassware

1. To remove organic residues, rinse glasware briefly with an organic solvent (acetone or ethanol).
2. Use warm tap water and a brush with soapy water to scrub the inside of curved glassware.
3. Remove soapsuds with deionized water to avoid harsh water stains.

How do you clean the inside of a crucible?

You can clean your crucible also at high temperature by using standard white glass (e.g. from yoghurt or glass bottles) which are typically lime-soda-silica glasses with a melting point of around 1040°C. So, put some glass material into the crucible and put it at 1100°C or 1200°C.

How do you melt bicarbonate in a crucible?

Heat the crucible until the fused bicarbonate melts. Heat it until a layer of red potassium salt appears on the surface. Using a mixing rod, stir the melt a few times. The entire melting procedure should take about one minute. Step 4: Remove your crucible from the flame.

What is a crucible used for in chemistry?

A crucible is a container that can withstand very high temperatures and is used to keep metals, glass, and pigment for melting in a furnace. Laboratory crucibles are designed to withstand relative high temperatures encountered in the metal casting experiments.

How to fill a ceramic crucible with fused potassium bicarbonate?

Therefore, ceramic crucibles are usually preferred for lab men. Step 2: Fill your ceramic crucible with fused potassium bicarbonate (solid form). You should have enough bicarbonate in the crucible to fill past the line of the remaining material from your experiments. If you need to fill the entire crucible, do so.