| Answer | Crossword Clue |
|---|---|
| BASIC | Having a pH higher than 7 |
| ALKALI | Substance with a pH higher than 7 |
| ALKALI | Its pH is higher than 7 |
| ACID | Having a pH value of less than 7 |
| acidic | having a pH value of less than 7 |
| alkaline | Having the properties of an alkali, or containing alkali; having a pH greater than 7 |
