Titration and Lab Safety Review

Flashcards on solution preparation, titration techniques, and lab safety.

How do you prepare a standard solution?

Measure the required mass of solid using a balance, transfer to a volumetric flask, rinse any remaining solid into the flask, add distilled water to dissolve the solid, swirl to mix, then add more distilled water up to the line, and invert to mix.

What is the weighing by difference technique?

A method to accurately weigh materials by subtracting the mass of the weighing dish after substance transfer from the mass of the dish and substance.

What equipment is used to perform a titration?

A pipette and pipette filler to accurately measure reactant volume into a conical flask, and a burette to add small volumes of one reactant to another until completion.

How do you carry out a titration?

Place one reactant into the conical flask using a pipette, fill the burette with the other reactant and record the initial volume, add indicator to the flask, add reactant from the burette while swirling, close the tap at the color change, record the final volume, and repeat until concordant results are obtained, then calculate the mean titre.

Why are acid-base indicators used?

To detect when a reaction is complete, usually indicated by a color change.

What are some common potential hazards and risks in the laboratory?

Bunsen burners (burns), chemicals (irritation, corrosive, toxic, flammable), glassware (cuts).

What are controls for Bunsen burner hazards?

Keep away from flammable chemicals and away from the edge of the desk.

What are controls for chemical hazards?

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.

What are controls for glassware hazards?

Handle with care. Keep away from the edge of the desk.

What are concordant results?

Results that are within 0.1 of each other