Question

the sticky substance formed when soap is added to hard water is____________

Answer 1

Answer:

sticky substance formed when soap is added to hard water is scum or scum form

Answer 2

Sticky substance is formed when soap is added to the hard water is called as  lime soap.

Explanation:

The soap containing anionic surfactants which reacts with water and thus produce sticky substance called lime soap.$2C_{17} H_{35} COO^-Na^++Ca^2=(C_{17} H_{35} COO)^2Ca+2Na^+$