Rules for reagents and equipment use

Solutions and solid reagents are to be stored in glassware (flasks, boxes), covered with glass (ground), rubber or cork stoppers. All flasks with reagents are to be kept closed and are to be opened only when being used. Closing flasks do not confuse stoppers, or reagents will be contaminated and unfit. Before taking the flask with reagent from the shelf, read the etiquette with its name attentively; after using it is necessary to bring the flask back.

All flasks with reagents always must be provided with the etiquette with the substance name or chemical formula. For solutions the concentration should be marked. Reagents in the flasks without etiquette are to be excluded and exterminated.

If there is no instruction on the reagents dosage, it is necessary to take reagent as little as possible, namely: the amount that covers the bottom of the test tube of solid substance and 1-2 mL of solutions. It is not allowed to bring remains of reagents back to the glassware where they were taken from. After the using of reagent it is necessary to cover the box or flask with stopper immediately and bring it back to its place.

Solid substances are to be taken with dry and clean horn, porcelain, metallic spoons or spreading rods (shovels), after using they are to be wiped thoroughly (the best is with filter paper).

When liquid is poured from the flask, keep the flask so that etiquette is on the top in order the drops of reagent flowing down could not damage etiquette. Practically, it is necessary to take the flask so that etiquette is in your palm and to take off the last drop of reagent with the edge of glassware where reagent is poured in. Using pipette, it is necessary to wash it thoroughly before taking the reagent from other flask.

At diluting the concentrated acid (Sulfuric especially) it is necessary to pour acid in water, but not on the contrary.

Excess amounts of reagents containing poisonous substances are not allowed to be poured to the sewerage; they are to be poured in special flasks.

Date: 2015-01-12; view: 923