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Basic Notes for working on a Laboratory
For proper cleaning of the glassware, check Koch Lab protocols: General Lab Techniques. Cleaning of the glassware
Important side notes:
Disposal of used acid and used base
Pour the excess of acid or base into a big beaker full of RUNING water. Let it flow until everything is dissolved.
The concentrated acid or concentrated base is always added to water and not the other way round for two main reasons:
Gloves, wax weighting paper, and any other material that has or may have been in contact with the acid of base should be discarded in a properly designated waste bag.
How to properly weight a sample
First, make sure the scale is balanced or leveled. Do not make rough movement close to the balance, since it is very sensitive. Finally, try to keep the glass windows on the side of the balance closed, at least as much as you can.
To weight a sample, use either weighing (wax) paper or weighing boats.
Take the wax paper or the weighing boats from storage.Do it on such way that you would avoid the contact with the rest of the stoke as much as you can. Once they have been removed from the original container, they need to be used or discarded, they cannot be placed back once they are out.