Laboratory Techniques and Safety

Vocabulary flashcards based on lecture notes about laboratory techniques.

Standard Solution

A solution with a precisely known concentration.

How to Make a Standard Solution

Measure the mass of solid required, transfer to a volumetric flask, rinse the weighing bottle into the flask with distilled water, add distilled water to dissolve, swirl, add more distilled water up to the line, invert multiple times to mix.

Weighing by Difference Technique

A method to weigh materials accurately; Mass of substance = Mass of weighing dish and substance - Mass of dish after substance has been transferred.

Titration Equipment

A pipette and pipette filler are used to accurately measure out the volume of a reactant, and a burette is used to add small volumes of one reactant to the other reactant.

How to Carry Out a Titration

Place one reactant into the conical flask using a pipette, fill the burette with the other reactant (record initial volume), add indicator to the conical flask, open the burette tap and allow the reactant to flow into the conical flask (swirling), close the burette tap once the expected colour change occurs, record final burette volume, and repeat until you get concordant results.

Acid-Base Indicators

Substances used to detect when a reaction reaches completion, usually by a colour change.

Bunsen Burner Hazard and Control

Burns; keep away from flammable chemicals and away from the edge of the desk.

Chemicals Hazard and Control

Irritation to skin, eyes, lungs, toxic and/or flammable; Handle with care while wearing gloves and eye protection; keep away from the edge of the desk and from an open flame; don’t ingest.

Glassware Hazard and Control

May break and cut you; Handle with care and keep away from edge of the desk.