| 1 | Determination of acidity to phenolphthalein. | |
| 2 | Black's not even on the chart. - Bad phenolphthalein? | |
| 3 | Soluble in water, its aqueous solution is strongly alkaline, can phenolphthalein red. | |
| 4 | It is reacted with phenol to produce phenolphthalein, used as an indicator, a dye, and a pharmaceutical. | |
| 5 | Put cutting onto porcelain and drop liquid of phenolphthalein on it , if the color turn into red , that means there is cement in the cutting. |