Analytical Chemistry Exam 1 2025
Questions and Answers
What does an analytical chemist do? - --Answer --Identifying what is in an
unknown is called qualitative analysis. Identifying how much is present is called
quantitative analysis.
Describe the steps in a chemical analysis. - --Answer --1) What do you want
to know? -What substance (analyte) are you looking for? 2) Select appropriate
procedures -Literature Search -New Procedure 3) Gathering Representative
Samples -Random heterogeneous material-Segregated heterogeneous material
4) Preparing Samples for Analysis 5) The Actual Analysis 6) Setting Up Calibration
Curves 7) What Do The Results Mean? 8) Reporting your Results-A complete
report, including a discussion of the limitations of the data and the analysis. 9)
Drawing Conclusions-how can this Information be used
SI units - --Answer --meter m: kilogram kg: second s: current ampere A:
temperature kelvin K: candela cd: mole mol:
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,Prefixes - --Answer --yotta- (Y-) 10²⁴: zetta- (Z-)10²¹: exa- (E-) 10¹⁸: peta-
(P-)10¹⁵: tera- (T-)10¹²: giga- (G-)10⁹: mega- (M-) 10⁶: kilo- (k-)10³: hecto- (h-)10²:
deka- (da-)**10: deci- (d-)10⁻¹: centi- (c-)10⁻²: milli- (m-)10⁻³: micro- (µ-)10⁻⁶:
nano- (n-)10⁻⁹: pico- (p-)10⁻¹²: femto- (f-)
10⁻¹⁵: atto- (a-)10⁻¹⁸: zepto- (z-)10⁻²¹: yocto- (y-)10⁻²⁴
Dilution of Solutions - --Answer --M1V1=M2V2
Molarity - --Answer --Moles of solute per liter of solvent.
Molality - --Answer --Moles of solute per kilogram of solvent.
Titration - --Answer --A solution of known concentration is used to
determine the concentration of another solution.
Titrant - --Answer --A titrant is a chemical reagent with known
concentration, which is added to the analyte during the process of titration, in
order to calculate the concentration of the analyte in the solution.
The Equivalence Point - --Answer --Point in a titration when there are
"equivalent" amounts of titrant and analyte.
Standard Solution - --Answer --The titrant (solution concentration known
with high accuracy).
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
, End Point - --Answer --Point in a titration when some noticeable signal
indicates equivalence point. The END point and EQUIVALENCE point may not
be the same.
Primary Standard - --Answer --Highly purified compound that is used as a
reference material to "standardize" solutions.STABLE, READILY AVAILABLE,
GOOD SOLUBILITY, and LARGE MOLECULAR MASS.
How is the end point detected? - --Answer --Commonly relies on electrodes
or indicators.
What is titration error? - --Answer --The difference between the end point
and the equivalence point. Error can be reduced by subtracting results of a blank
titration,(same procedure in absence of analyte), or by standardizing the titrant.
What is a blank titration? - --Answer --We estimate the titration error with a
blank titration, in which we carry out the same procedure without analyte.
What is standardization? - --Answer --A titrant is made with approx. The
desired concentration and use it to titrate a primary standard.Standardization, to
determine the concentration of titrant (standard solution).The validity of the
analytical result depends on knowing the composition of a primary standard.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
Questions and Answers
What does an analytical chemist do? - --Answer --Identifying what is in an
unknown is called qualitative analysis. Identifying how much is present is called
quantitative analysis.
Describe the steps in a chemical analysis. - --Answer --1) What do you want
to know? -What substance (analyte) are you looking for? 2) Select appropriate
procedures -Literature Search -New Procedure 3) Gathering Representative
Samples -Random heterogeneous material-Segregated heterogeneous material
4) Preparing Samples for Analysis 5) The Actual Analysis 6) Setting Up Calibration
Curves 7) What Do The Results Mean? 8) Reporting your Results-A complete
report, including a discussion of the limitations of the data and the analysis. 9)
Drawing Conclusions-how can this Information be used
SI units - --Answer --meter m: kilogram kg: second s: current ampere A:
temperature kelvin K: candela cd: mole mol:
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,Prefixes - --Answer --yotta- (Y-) 10²⁴: zetta- (Z-)10²¹: exa- (E-) 10¹⁸: peta-
(P-)10¹⁵: tera- (T-)10¹²: giga- (G-)10⁹: mega- (M-) 10⁶: kilo- (k-)10³: hecto- (h-)10²:
deka- (da-)**10: deci- (d-)10⁻¹: centi- (c-)10⁻²: milli- (m-)10⁻³: micro- (µ-)10⁻⁶:
nano- (n-)10⁻⁹: pico- (p-)10⁻¹²: femto- (f-)
10⁻¹⁵: atto- (a-)10⁻¹⁸: zepto- (z-)10⁻²¹: yocto- (y-)10⁻²⁴
Dilution of Solutions - --Answer --M1V1=M2V2
Molarity - --Answer --Moles of solute per liter of solvent.
Molality - --Answer --Moles of solute per kilogram of solvent.
Titration - --Answer --A solution of known concentration is used to
determine the concentration of another solution.
Titrant - --Answer --A titrant is a chemical reagent with known
concentration, which is added to the analyte during the process of titration, in
order to calculate the concentration of the analyte in the solution.
The Equivalence Point - --Answer --Point in a titration when there are
"equivalent" amounts of titrant and analyte.
Standard Solution - --Answer --The titrant (solution concentration known
with high accuracy).
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
, End Point - --Answer --Point in a titration when some noticeable signal
indicates equivalence point. The END point and EQUIVALENCE point may not
be the same.
Primary Standard - --Answer --Highly purified compound that is used as a
reference material to "standardize" solutions.STABLE, READILY AVAILABLE,
GOOD SOLUBILITY, and LARGE MOLECULAR MASS.
How is the end point detected? - --Answer --Commonly relies on electrodes
or indicators.
What is titration error? - --Answer --The difference between the end point
and the equivalence point. Error can be reduced by subtracting results of a blank
titration,(same procedure in absence of analyte), or by standardizing the titrant.
What is a blank titration? - --Answer --We estimate the titration error with a
blank titration, in which we carry out the same procedure without analyte.
What is standardization? - --Answer --A titrant is made with approx. The
desired concentration and use it to titrate a primary standard.Standardization, to
determine the concentration of titrant (standard solution).The validity of the
analytical result depends on knowing the composition of a primary standard.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
