Chapter 4 Key Concepts Flashcards
1
Q
What are titrations used for
A
Used to
- accurately measure volume of one solution that exactly reacts with another solution
- find concentration of unknown solution
- find purity of a substance
- identifying unknown substances
2
Q
Why is it important to check for purity
A
- quality control
- esp for things made for human use eg cosmetics,medicines, food, cosmetics
- need to have a lot of purity, tiny amount of impurity could cause great harm to patient
3
Q
Difference between oxidation and charge when writing the signs
A
Oxidation +2
Charge 2+
4
Q
Special cases of oxidation numbers
A
H in metal hydrides eg NaH is -1
Oxygen in hydrogen peroxide is -1
Oxygen bonded to fluorine eg F2O is +2
5
Q
When do you use Roman Numerals?
A
Use in the names of compounds of elements that from ions with different charges to show the oxidation state
