Question:
Cyanide used in nepheloturbidometry as a salt of
Cyanide used in nepheloturbidometry as a salt of
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In nepheloturbidometry, silver cyanide (AgCN) is the common cyanide salt due to its precipitate formation causing turbidity.
Updated On: Jul 14, 2026
- Ag
- Au
- Na
- K
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The Correct Option is A
Approach Solution - 1
- Nepheloturbidometry is an analytical technique used to measure the turbidity or cloudiness of a solution, often due to suspended particles.
- In nepheloturbidometry, cyanide ions are commonly used as silver cyanide (AgCN) salt.
- Silver cyanide forms a precipitate that scatters light, which is measured to determine the concentration of analytes.
- The salt of silver (Ag) is preferred because of its stable complex formation with cyanide and well-defined turbidity properties.
- Salts of gold (Au), sodium (Na), or potassium (K) cyanide are not typically used for this purpose in nepheloturbidometry.
- In nepheloturbidometry, cyanide ions are commonly used as silver cyanide (AgCN) salt.
- Silver cyanide forms a precipitate that scatters light, which is measured to determine the concentration of analytes.
- The salt of silver (Ag) is preferred because of its stable complex formation with cyanide and well-defined turbidity properties.
- Salts of gold (Au), sodium (Na), or potassium (K) cyanide are not typically used for this purpose in nepheloturbidometry.
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Approach Solution -2
The question asks which metal's cyanide salt is used in nepheloturbidometry. This technique measures light scattered or blocked by a fine, uniform precipitate, so the salt used has to reliably form that kind of precipitate with the analyte.
- Ag: Silver cyanide forms a fine, insoluble, well-defined precipitate when reacted with the analyte under controlled conditions, giving a reproducible turbidity that can be measured photometrically. This reliable precipitate formation is why silver is chosen for this application.
- Au: Gold cyanide complexes are more commonly associated with gold extraction and electroplating chemistry rather than forming the controlled fine turbid precipitate needed for nepheloturbidometric assay.
- Na: Sodium cyanide is highly water-soluble and does not itself form a light-scattering precipitate, so it cannot serve as the reagent whose turbidity is being measured.
- K: Potassium cyanide is likewise freely soluble in water and does not produce the insoluble particulate needed for a nephelometric or turbidimetric measurement.
Because the assay depends on forming a stable, finely divided, light-scattering precipitate, only the silver salt of cyanide fits the requirement, while the sodium and potassium salts stay in solution and gold cyanide is not the reagent used for this purpose.
Therefore, the correct answer is Ag.
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