Titrations Flashcards
How would you read a burrette?
two decimal points (00.01 mL)
What is the primary standard of the expeirment?
oxalic acid dihydrate
Acids ____ protons while bases ____ protons.
1) donate
2) accept
What is a neutralization reaction?
A type of double displacement reaction that transfers protons from an acid to a base
What does the acid strength of a Bronsted-Lowry acid refer to?
The ability of an acid to relinquish (keep or donate) protons
What is the relation between the acid strength and conjugate base strength?
The strength of an acid is inversely related to the strength of its conjugate base
How the product from a neutralization reaction containing a strong acid different from a weak acid?
Strong acids fully ionize while weak bases produce a salt and water
What is a secondary standard?
a chemical that is standardized against a primary standard
What is a primary standard?
oxalic acid dihydrate (H2C2O4*2H2O)
What pH causes phenolphthalein to change colour?
8.0-10.0 pH
Phenolphthalein’s protonated form is what colour?
colourless
Phenolphthalein’s unprotonated form is what colour?
red (respectively)
How does phenolphtalein work?
Phenolphthalein relinquishes its own protons in an attempt to replace those being removed by NaOH during the titration, producing the pink colour change.
What is the equivalence point? (3)
Is when the acid and base are:
- Reactants are combined in stoichiometric proportionthe
- Reaction is complete
- No excess reactant remains
What is the secondary standard of the experiment?
NaOH
How many OH- will a diprotic acid neutralize?
2
What are the three benefits of weighing by difference?
1) Beakers don’t have to be dry
2) Do not need to zero between weighs
3) Only n+1 weighings are required to prepare n amount of samples
Titrant
Is dispensed from the burette
