Complete the following: Indicator Color Acidic medium Basic medium Litmus Red _____ _____ Colorless Red _____ juice Yellow Red-brown Red-cabbage juice _____ Green China-rose juice Red _____

Indicator Colour Acidic medium Basic medium Litmus Red Blue Phenolphthalein Colourless Red Turmeric juice Yellow Red-brown Red-cabbage juice Red Green China-rose juice Red Green An acid-base indicator is either a weak acid or weak base that exhibits a colour change as the concentration of hydrogen or hydroxide ions changes in an aqueous solution. Litmus paper changes red colour in acidic medium and blue colour in basic medium. Phenolphthalein turns red or pink in basic solutions and is colourless in acidic and neutral media. Turmeric juice: The yellow turmeric juice turns reddish to deep brown in a basic medium and remains yellow in an acidic or neutral medium. Red-cabbage juice: Red-cabbage juice, purple, turns green in a basic medium and red in an acidic solution. China-rose juice: This turns green in a basic medium and red in an acidic solution.