Ana Chem LEC Concepts Flashcards
Difference between Qualitative and Quantitative Analaysis
-Qualitative Analysis reveals the identity of the elements and compounds in a sample.
- Quantitative Analysis indicates the amount of each substance in a sample.
One is the mass or the volume of sample to be analyzed.
Classical Instruments
The measurement of some quantity that is proportional to the amount of analyte in the sample, such as mass, volume, intensity of light, or electric charge.
Instrumental Methods
Difference of Pre-Equivalence, Equivalence, Post
Pre-equivalence – Calculating PH from the molar concentration of unreacted acid.
Equivalence – The solution is neutral at pH=7.00
post-equivalence- pOH calculation; pH=pKw – pOH=14.00-pOH
Where C1V1 is used
Dilution
a reagent of known concentration that is used in a titrimetic analysis.
Standard Solution
often added to the analyte solution to give an observable physical change at or near the equivalence point.
Indicator
Size of Colloid
10^-4
A process in which a minimum number of atoms, ions, or molecules join together to produce a stable solid.
Nucleation
The particle size of a freshly formed precipitate is determined by which way is faster.
Particle Growth
one of the ions in the crystal lattice of a solid is replaced by an ion of another element.
Mixed-crystal formation
The difference in volume or mass between the equivalence point and the end point.
Titration Error
is the number of moles of strong acid or strong base that causes one liter of the buffer to change pH by one unit.
Buffer Capacity
strong acids and strong bases cause the most pronounced change in pH at the equivalence point.
Neutralization
Seven basic SI Unit
Mass – Kilogram
Length – Meter
Time – Second
Temperature – Kelvin
Amount of substance – mole
Electric current – ampere
Luminous intensity - Candela
