25. Solving a chemistry problem

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• A colloidal solution (sol) of AD was obtained by mixing V1 ml of an aqueous solution of AE with a molar concentration of C1 and V2 ml of an aqueous solution of VD with a molar concentration of C2 (data for the solution are given in Table 3.1).
• Write the reaction equation and determine which of the reaction products forms a sol.
• Calculate which of the starting substances – AC or VD – was taken in excess.
• Write the formula of the micelle of the resulting AD sol and indicate the charge of the colloidal particle (granules).
• Determine which electrode and which part of the micelle will move during electroosmosis.
• For these electrolytes: K2SO4, NaNO3, Na3PO4, MgCl2, CdSO4, Al2(SO4)3: a) determine which of the electrolyte ions will cause coagulation, and arrange the ions in a row in order of decreasing coagulation threshold; b) calculate the coagulation thresholds C in the AD ash for each of the proposed electrolytes, using the Schultz-Hardy rule or the Deryagin-Landau law, if the coagulation threshold of the AD hydrosol under the influence of the KNO3 electrolyte is equal to C (Table 3.1).

Problem number AD AE V1, ml C1, mol/l VD V2, l C2, mol/l Sk mol/l

225 ZnS (NH4)2S 3 0.05 ZnCl2 10 0.01 4.5*10-2

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