phenolphthalein

Example:The solution changes color when phenolphthalein is added, indicating the presence of an alkali.

Definition:A substance that changes color in the presence of certain ions, acids, or bases, so that the presence or concentration of these substances can be detected.

Example:In the laboratory, phenolphthalein is used as an indicator in buffer solutions to ensure the pH is within a specific range.

Definition:A solution or mixture that resists changes in its pH when small quantities of an acid or base are added to it, maintaining a stable pH range.

Example:The phenolphthalein test was positive for alkalinity, confirming that the solution was basic.

Definition:Pertaining to or having the properties of an alkali, characteristically having a pH greater than 7, bitter to taste, and able to react with acids to form salts.

Example:Phenolphthalein, in its basic form, is colorless, but it turns pink in the presence of an alkali.

Definition:Without color or the color which is usually expected of something (as the color which is usually seen in a gas or liquid)

Example:Adding phenolphthalein to an alkaline solution turns it a pink color, indicating the presence of an alkali.

Definition:Any of various inorganic bases, especially soluble salts of alkaline earth metals, used especially in making soap and glass and in adjusting the pH of dilute solutions and soils.