Question

Does adding salt to water increase surface tension?

Answer 1

Due to the cohesive nature of the water molecules, surface tension can be defined as a property of a liquid's surface that allows it to resist an external force. The surface tension of water provides the required wall tension for bubble formation in water. The desire to reduce wall tension causes the bubbles to form spherical shapes.

Complete answer:
The surface tension of water is increased when salt is added to it. Although the strong interactions between sodium cations and partial negative oxygen, and chloride anions and partial positive hydrogens disrupt some hydrogen bonding between water molecules, they actually strengthen the surface tension of water.
Due to solute depletion at the interface, adding a solute to a solvent can cause an increase in surface tension, such as salt in water and water in alcohol. Electrostatic forces or solute-solvent attraction may cause the solute to repel from the interface.
Because a molecule at the surface only has neighbours on one side, it has half as many intermolecular bonds as a molecule in the bulk solution. This means that molecules near the surface have more energy, which manifests as an effective force that 'pulls' water molecules inwards and reduces the surface area.
Surface tension is determined by intermolecular bonds, so stronger intermolecular bonds result in higher surface tension. Surface tension is reduced by molecules that disrupt and weaken the network of intermolecular bonds (such as detergent).

Note:
Temperature changes, chemicals that change the bonding characteristics of the molecules, oxidation, and the presence of impurities can all change the surface tension characteristics of a fluidic substance.