Student groups are given an unknown liquid to test using the four indicators. one group conducts the tests and records these results. color changes - ph indicators indicator used color produced methyl violet bluish bromophenol blue yellow phenolphthalein colorless thymolphthalein colorless using the table of indicator values, determine the approximate ph of the unknown solution. a) 1.6 b) > 3.0 c) between 0 and 1.6 d) between 1.6 and 3.0