54. With a sufficiently slow introduction of substance B (Pb (NO3) 2) into a dilute solution of substance A (Na2SO4), the formation of a hydrosol of substance C (PbSO4) is possible. Write the formulas of a micelle and indicate the sign of the electric charge of the colloidal particles of this sol.
A B C
Na2SO4 Pb(NO3)2 PbSO4

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