Acids and basesOnline version In nature there are different types of substances, some are ACID, other BASIC and other NEUTRAL. To determine the type of a particular substance, we use pH indicators. These indicators change colour according to the type of substance with which they come into contact, thus establishing a scale of acidity and basicity. by EDELMIRA RIERO ROMERO 1 How do we get the PH indicator mixture? Select one or more answers a Cooking a red cabbage b With a solution of lye, lemon, ammonia and water 2 With what substance do we get better and faster results? Select one or more answers a Lemon b Bleach 3 Name the four substances used Written answer