2nd Exam definitions

Question 1

Measure volume of known concentration needed to react completely w analyte

Mass of the reagent is measured instead of volume

Under constant direct electric current that indirectly reacts w/ analyte. Time required to complete electrochemical reaction is measured

Answer 1

Volumetric Titrimetry

Gravimetric Titrimetry

Coulometric Titrimetry

Question 2

A reagent of exactly known concentration used in a titrimetric analysis

An ultrapure compound that serves as the reference material for a titrimetric method of analysis

Compound whose purity has been established by chemical analysis and serves as reference material for a titrimetric method of analysis

Answer 2

Standard solution

Primary standard

Secondary standard

Question 3

Process where a standard reagent is added to a solution of an analyte until reaction is complete

Process where excess of standard solution is used, used when reaction is slow or lacks stability

Answer 3

Titration

Back titration

Question 4

a process in which the concentration of a volumetric solution (secondary standard) is determined by using it to titrate a known mass of a primary standard or an exactly known volume of another secondary standard solution.

the point in a titration when the amount of added standard reagent is exactly equivalent to the amount of
analyte.

point in a titration when a physical change occurs that is associated with the condition of chemical equivalence.

difference in volume or mass between the equivalence point and the end point is the ___

Answer 4

Standardization

equivalence point

End Point

Titration error: Et = Vep-Veq

Question 5

a carefully weighed quantity of a primary standard is dissolved in a suitable solvent and diluted to an exactly known volume in a volumetric flask

Answer 5

Direct Method

Question 6

Types of titration reaction

Answer 6

Acid-base titration: between analyte and acidic or basic titrant. With pH based indicator

Redox titration: Oxidation reaction. Uses potentiometer or redox indicator. Sometimes indicator not needed.

Complexometric titration: based on the formation of a complex between the analyte and the titrant.

Precipitation titration: The titrant forms an insoluble product with the analyte.

Question 7

is very commonly used to titrate metal ions in
solution.

is used for the titration of calcium and magnesium ions

Answer 7

EDTA

Eriochrome Black T

Question 8

Where an element is converted into NH3 and then distilled into a known volume of standard acid

Answer 8

Kjeldahl method for nitrogen