ANALYTICAL CHEMISTRY EXAM ACTUAL
TEST PAPER WITH FULL SOLVED QUESTIONS
AND CORRECT ANSWERS GRADED A PLUS
◉ ANALYTICAL CHEMISTRY. Answer: Branch of chemistry that
deals with the separation, identification and composition of matter
◉ Gravimetric Method. Answer: Measurement of mass of substance
that is chemically related to the analyte
◉ Volumetric Method. Answer: Measures the volume of solution
necessary to read completely with the analyte.
◉ Spectroscopic Method. Answer: Measures the electromagnetic
radiation produced by the analyte or its interactions with it.
◉ Electroanalytic Method. Answer: Measures the electrical properties
of the analyte such as current, potential, resistance, and amount of
charge
◉ Kjeldahl Method. Answer: Determination of Organic Nitrogen
(Amines, Amides, Nitriles and Nitro Group: %N or %Protein
, ◉ Double Indicator Method. Answer: To determine the composition
of a soda ash sample. Two indicators (one alkaline range one acidic)
Example: Phenolphthalein endpoint (Na2CO3 and NaOH) and methyl
red endpoint (Na2CO3 and NaHCO3)
◉ Argentometric titration. Answer: Titration with Silver Nitrate
AgNO3
◉ Mohr Method. Answer: Direct method for halides and cyanides;
Titration is carried out between pH of 7-10. Usually, a low
concentration of chromate is desired to detect the end point clearly
since a chromate ion imparts an intense yellow color.
◉ Volhard Method. Answer: For the formation of a colored
complexion; Direct method for silver; Indirect method for halides;
Titration is carried out in acidic condition to hasten precipitation of
ferric ion to its hydrated oxide form.
◉ Fajan's Method. Answer: For the formation of a colored adsorption
complex; same as Mohr's but uses DCF dichlorofluorescein; between
pH 4-7, dextrin is added to prevent excessive coagulation of the AgCl
precipitate.
◉ Liebig Method. Answer: Determination of Cyanide, carried by the
dropwise addition of AgNO3 in a solution of a cyanide forming a
soluble cyanide complex of silver
TEST PAPER WITH FULL SOLVED QUESTIONS
AND CORRECT ANSWERS GRADED A PLUS
◉ ANALYTICAL CHEMISTRY. Answer: Branch of chemistry that
deals with the separation, identification and composition of matter
◉ Gravimetric Method. Answer: Measurement of mass of substance
that is chemically related to the analyte
◉ Volumetric Method. Answer: Measures the volume of solution
necessary to read completely with the analyte.
◉ Spectroscopic Method. Answer: Measures the electromagnetic
radiation produced by the analyte or its interactions with it.
◉ Electroanalytic Method. Answer: Measures the electrical properties
of the analyte such as current, potential, resistance, and amount of
charge
◉ Kjeldahl Method. Answer: Determination of Organic Nitrogen
(Amines, Amides, Nitriles and Nitro Group: %N or %Protein
, ◉ Double Indicator Method. Answer: To determine the composition
of a soda ash sample. Two indicators (one alkaline range one acidic)
Example: Phenolphthalein endpoint (Na2CO3 and NaOH) and methyl
red endpoint (Na2CO3 and NaHCO3)
◉ Argentometric titration. Answer: Titration with Silver Nitrate
AgNO3
◉ Mohr Method. Answer: Direct method for halides and cyanides;
Titration is carried out between pH of 7-10. Usually, a low
concentration of chromate is desired to detect the end point clearly
since a chromate ion imparts an intense yellow color.
◉ Volhard Method. Answer: For the formation of a colored
complexion; Direct method for silver; Indirect method for halides;
Titration is carried out in acidic condition to hasten precipitation of
ferric ion to its hydrated oxide form.
◉ Fajan's Method. Answer: For the formation of a colored adsorption
complex; same as Mohr's but uses DCF dichlorofluorescein; between
pH 4-7, dextrin is added to prevent excessive coagulation of the AgCl
precipitate.
◉ Liebig Method. Answer: Determination of Cyanide, carried by the
dropwise addition of AgNO3 in a solution of a cyanide forming a
soluble cyanide complex of silver
