5. There are solutions of the same concentration: H2SO4 and butyric acid. Counting drops using the stalagmometric method showed: the number of drops of H2O is 28, H2SO4 is 20 and butyric acid is 56. Which acid is a surfactant, which is a PIV, if b(H2O)=72.75*10-3 N/m.

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