The stability of foams is primarily attributed to the presence of:
Electrostatic repulsion
Hydrogen bonding
Van der Waals forces
Surfactants
Surfactants are molecules that accumulate at the liquid-gas interface and stabilize foams by reducing surface tension.
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5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C. If Na2SO4 is 81.5% ionised, the value of x (K

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