The exact pH of plaster of Paris can vary depending on factors such as:
* Purity: Impurities in the plaster can affect its pH.
* Water content: The hydration process, which involves adding water to the plaster, can influence pH.
* Setting time: As the plaster sets and hardens, its pH may change slightly.
Generally, the pH of plaster of Paris is in the range of 5.5 to 7.0.
It's important to note that this is a rough estimate, and specific pH measurements might be necessary in certain applications.