The pH of calcium phosphate is approximately 4, although this buffering range is outside the physiological range.
Here's a more detailed explanation:
Calcium phosphate, by itself, can reduce acidity. However, its effectiveness in buffering solutions is limited to a pH around 4. This pH is lower than the normal physiological pH (around 7.4). This means that calcium phosphate alone is not very effective at maintaining a neutral pH in biological systems.
To achieve a pH closer to the physiological range, modifications or combinations are needed. For example, carbonated calcium phosphates and calcium carbonate (calcite) are capable of maintaining a pH closer to 7.4.
In summary:
- Calcium Phosphate (alone): Buffers around pH 4.
- Carbonated Calcium Phosphate/Calcium Carbonate: Buffers around pH 7.4.
Therefore, when discussing the pH of calcium phosphate, it is important to specify whether it is unmodified calcium phosphate or a modified form such as carbonated calcium phosphate.
