93. Solving a chemistry problem

7. When studying the process of coagulation of a hydrosol, fashionable solutions of KCl, Na2SO4, Na3PO4 were added to its determined (100 ml). the concentrations and volumes of which are given in Table 7. Calculate the coagulation thresholds of the Sol for each of the indicated electrolytes.
variant number KCl Na2SO4 Na3PO4
V, ml С, mol/l V, ml С, mol/l V, ml С, mol/l
9 6.2 2.2 15.2 0.022 25 0.002

When solving this task, keep in mind that when calculating the coagulation threshold, the volume of added electrolyte can be neglected only if the calculation error does not exceed 5%. Pay attention to the strong influence of the charge of the coagulating ion on the value of the coagulation threshold.