Final answer:
The carpet cleaner with a pH of 7, as indicated by the pH paper, is neutral, neither acidic nor alkaline.
Step-by-step explanation:
When carpet cleaner is put on pH paper and it turns to 7 on the pH scale, it indicates that the solution is neutral. pH is a scale used to determine the acidity or alkalinity of a substance. A pH of 7 is considered neutral, meaning it is neither acidic nor alkaline. Substances with a pH less than 7 are acidic, and substances with a pH greater than 7 are alkaline or basic. For example, human blood with a pH of 7.4 is slightly alkaline, household ammonia with a pH of 11.0 is alkaline, and cherries with a pH of 3.6 are acidic.