The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3

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Question

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 sol are given below:I. NaCl = 52 mmol/LII. BaCl2 = 0.69 mmol/LIII. MgSO4 = 0.22 mmol/LThe correct order of their coagulating power is:

Accepted Answer

Correct Answer: A — III > II > IStep-by-step Solution:Coagulation value is the minimum concentration of an electrolyte (in mmol/L) required to coagulate a colloid. A lower coagulation value means less electrolyte is needed, so that electrolyte is more effective (higher coagulating power).Coagulating power is inversely proportional to the coagulation value:Coagulating power &#8733; 1 / (coagulation value)MgSO4 (0.22 mmol/L) has the lowest coagulation value → highest coagulating power.BaCl2 (0.69 mmol/L) is next.NaCl (52 mmol/L) has the highest coagulation value → lowest coagulating power.Order: MgSO4 > BaCl2 > NaCl, i.e., III > II > I.Why other options are incorrect:Options B, C, D do not correctly invert the coagulation values to give the coagulating power order.Key Concept: Hardy-Schulze rule: The coagulating power of an electrolyte depends on the charge of the ion with opposite sign to the colloid. As2S3 is a negatively charged colloid, so cations cause coagulation. Higher the charge on the cation, greater the coagulating power (Mg2+ and Ba2+ are more effective than Na+). Coagulating power &#8733; 1/coagulation value.

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 sol are given below:I. NaCl = 52 mmol/LII. BaCl2 = 0.69 mmol/LIII. MgSO4 = 0.22 mmol/LThe correct order of their coagulating power is:

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The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 sol are given below:I. NaCl = 52 mmol/LII. BaCl2 = 0.69 mmol/LIII. MgSO4 = 0.22 mmol/LThe correct order of their coagulating power is:

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