The upper layer of the aqueous solution of sodium carbonate is colored purple with the indicator dye phenolphthalein, which means that the pH of the solution is alkaline.
Weakly concentrated aqueous solution of strong organic formic acid, colored with the indicator dye methyl orange.
An aqueous solution of the simplest organic formic acid colored red with an indicator dye, in a beaker.
Colorful liquid solutions of organic acid basic dyes are in glass jars.
The product of redox chemical reaction is manganese dioxide, in the form of brown colloidal particles.
The green solution of sodium hydroxide is colored with an indicator dye.
A strongly alkaline solution of sodium hydroxide in a conical flask with an indicator dye.