It is useful to know the colour of some compounds commonly reacted with acids to work out if a colour change has occurred.

Several different bases can neutralise acids, and water is always produced as a result of these reactions. Metal oxides and alkalis are two types of base. Basic substances neutralise acids ...

Students add laundry detergent powder (a base) and cream of tartar (an acid) to the indicator and see that the two solids cause different color changes. Students recognize that a particular color ...

Is it an acid, base, or neutral? Make your own acid-base indicator from red cabbage, then test various household substances. Acids and bases are classes of materials that have different properties.