5. The coagulation threshold of a positively charged iron hydroxide hydrosol under the action of sodium chloride is 9.25 mmol/l. Using the Schulze-Hardy rule and the Deryagin-Landau series, calculate the coagulation thresholds for this sol caused by the following electrolytes: potassium nitrate, barium chloride, potassium sulfate, magnesium sulfate, potassium dichromate, and potassium phosphate.

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