Titrimetric analysis is a quantitative analytical technique used to determine the concentration of an analyte through titration. Complexometric titrations involve metal ion determination using chelating agents like EDTA, while precipitation titrations rely on the formation of an insoluble precipitate. These methods are widely used in water hardness testing, pharmaceutical analysis, and industrial applications.
Fundamentals of Titrimetric Analysis
Titrimetric analysis involves: (a) Measuring the weight of the sample (b) Measuring the volume of a reagent required to react with an analyte (c) Measuring the electrical conductivity of a solution (d) Measuring the pH of a solution Answer: (b) Measuring the volume of a reagent required to react with an analyte
The equivalence point in a titration is defined as the point where: (a) The color of the indicator changes (b) The number of moles of titrant equals the number of moles of analyte (c) The solution becomes neutral (d) The volume of titrant is maximum Answer: (b) The number of moles of titrant equals the number of moles of analyte
Complexometric Titrations
Complexometric titrations are mainly used for the determination of: (a) Acids and bases (b) Metal ions (c) Non-metal elements (d) Redox species Answer: (b) Metal ions
Which reagent is most commonly used in complexometric titrations? (a) EDTA (b) HCl (c) NaOH (d) Potassium permanganate Answer: (a) EDTA
EDTA forms a complex with metal ions in a: (a) 1:1 molar ratio (b) 2:1 molar ratio (c) 1:2 molar ratio (d) Variable molar ratio Answer: (a) 1:1 molar ratio
Which indicator is commonly used in EDTA titrations? (a) Phenolphthalein (b) Eriochrome Black T (c) Methyl orange (d) Starch Answer: (b) Eriochrome Black T
Which metal ions can be determined using complexometric titration with EDTA? (a) Na+ and K+ (b) Ca2+ and Mg2+ (c) Cl– and Br– (d) SO42- and NO3– Answer: (b) Ca2+ and Mg2+
Precipitation Titrations
Precipitation titrations are used to determine: (a) Soluble salts (b) Metal ions that form insoluble precipitates (c) Acid-base equilibria (d) None of the above Answer: (b) Metal ions that form insoluble precipitates
Which of the following is commonly used in precipitation titrations? (a) Silver nitrate (AgNO3) (b) Hydrochloric acid (HCl) (c) Sodium hydroxide (NaOH) (d) Ammonia (NH3) Answer: (a) Silver nitrate (AgNO3)
Which indicator is used in the Mohr method of precipitation titration? (a) Starch (b) Phenolphthalein (c) Potassium chromate (K2CrO4) (d) Methyl orange Answer: (c) Potassium chromate (K2CrO4)
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