Briefly explain the purpose of the fecl3 test. what does a positive fecl3 test signify

FeCl3 test is used to find out the phenols in a sample or compound. Natural phenols in a plant extract can be determined using the FeCl3 test, for example. If the test results in dark brown solution it is a positive result signify that it contains phenols.

A Variable is a symbol for a number we don't know yet

Its called a constant