hello, sorry all = signs are meant to be arrows.
Acids and Bases
INDICATOR: a dye that changes colour
Universal indicator is a combination of dyes which changes colour depending on whether its above or below a certain PH.
0- STRONG ACID (red) it is a substance with PH lower than 7. FORMS H+ ions in water,
14- STRONG ALKALI (purple) a BASE is a substance with a PH greater than 7. An alkali is a base that dissolves in water. alkalis form OH- ions in water.
NEUTRAL = 7
ACID + BASE = SALT + WATER