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Cleaning Glassware (Post-Inorganic Synthesis)

There are several different methods used for cleaning glassware after Inorganic Synthesis. Below is a list of the steps we follow in the Inorganic Facility, including preparation of the acid and base baths commonly found in our facility. These steps are not a replacement for on-the-job training, PPE must be worn and safety procedures followed per staff-given instructions.


Step 1.    Rinse used glassware with an organic solvent to remove as much residue as possible (dispose of rinse waste in an appropriate waste container)

Step 2.    Slowly submerge dirty glassware in a base or acid bath (description below)

Step 3.    Allow glassware to sit in a base or acid bath for 24-72 hours (DO NOT leave glassware in an acid bath longer than necessary, or your glass will etch and crack)

Step 4.    Remove glassware from base or acid bath and place in a small bucket of water (dispose of this rinse water in an appropriate waste container)

Step 5.    Rinse glassware 4-5 times with water in the sink

Step 6.    Perform a final rinse with DI water and place glassware in a 120C oven to dry



PREPARATION OF BASE BATH (25g KOH/L IPA):

In a large plastic bucket with a loose lid, add the following:

           8L isopropanol

           200g potassium hydroxide           

    Note: The weight of potassium hydroxide does not need to be exact. You just need a supersaturated solution.



PREPARATION OF ACID BATH (3% HNO3/4% HCl/93% H2O):

In a large plastic bucket with a loose lid, add the following:


7.44L deionized water

240mL nitric acid

320mL hydrochloric acid



    Note: Be sure to add acid to water. These volumes may be approximated.
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