Question

11. What formula is used in finding the Molarity of an unknown acid or basic solution using the experimental titration procedure? 12. Given a clear solution that was either an acid or base, what could you do to confirm whether the solution was an acid or base? 9 Page 11 of 12

Answer 1

11) To find molarity in the acid-base titration we use a formula: EM1V1 = M2V2 where M1 = molarity of acid, V1 = volume of acid used, M2=molarity of base and V2 =volume of base 12) Acid solution can be tested with litmus paper: if blue litmus turns red we confirm solution to be an acid. And if red litmus turns blue then solution Eis basic in nature. Also we may use indicators such as and respective color to confirm acid/base nature: Indicator Acid color Base color Methyl orange: yellow phenolpthalein colorless magenta red

Indicator Acid Color Base Color thymol blue (first change) red yellow methyl orange red yellow bromocresol green yellow blue methyl red yellow red bromothymol blue yellow blue phenol red yellow red thymol blue (second change) yellow blue phenolphthalein colorless magenta