Definition: The associative property states that you can add or multiply regardless of how the numbers are grouped. By 'grouped' we mean 'how you use parenthesis'. In other words, if you are adding or multiplying it does not matter where you put the parenthesis.
Full Definition of ROSIN. : a translucent amber-colored to almost black brittle friable resin that is obtained from the oleoresin or deadwood of pine trees or from tall oil and used especially in making varnish.
Rosin is not soluble in water but some rosin fluxes are formulated to be soluble in water plus a saponifier that converts rosin to a soluble soap-like material. Water soluble fluxes are solutions of active chemicals, usually proprietary formulae, in solvents - usually non-aqueous.