Quiz on Precipitimetry

What are the conditions that the reaction used in precipitimetry must satisfy?

• The precipitate must be highly soluble, precipitation should be slow, and the end point must be difficult to detect.

• The precipitate must be practically insoluble, precipitation should be slow, and the end point must be difficult to detect.

• The precipitate must be practically insoluble, precipitation should be rapid, and the end point must be easily detected.

• The precipitate must be highly soluble, precipitation should be rapid, and the end point must be easily detected.

What is the formula for calculating the solubility product of a sparingly soluble salt?

• Ksp = [A-] [B+] = Kf

• Ksp = [A-] [B+] = Ksp

• Ksp = [A-] [B+]

• Ksp = [A-] [B+]

In Denige's Modification, what is used to detect the end point in the determination of cyanide ion with silver ion?

• Chromate ion

• Silver iodide

• Silver chloride

• Ammonia

What is the method used for the determination of chloride and bromide by titration with silver nitrate?

• Fajan's Method

• Liebeg's Method

• Volhard's Method

• Mohr's Method

What is the effect of temperature on the solubility of salts in a precipitation reaction?

• Increased temperature decreases solubility

• Increased temperature increases solubility

• Increased temperature has no effect on solubility

• Increased temperature only affects solubility of sparingly soluble salts

What is the concentration of chromate necessary to give the brick red precipitate of silver chromate at equivalence point?

• 0.02M

• 0.01M

• 0.005M

• 0.015M

Which indicator is used for the determination of zinc ion by precipitation with potassium ferrocyanide?

• Uranyl nitrate

• Diphenylamine

• Fluorescein

• Eosin

What color change indicates the end point of the reaction between zinc ions and potassium ferrocyanide?

• Yellow to Pink

• Pink to Blue

• Brown to Violet

• Blue to Faint Blue

How is sulphate determined using rhodizonate as an indicator?

• By forming a red precipitate

• By adding known excess standard barium chloride

• Directly with standard sodium sulphate

• By titrating excess barium with sodium sulphate

Which method is used for the determination of barium and sulphate?

• Adsorption Indicator method

• External indicator method

• Fajan's method

• Volhard's method