The pH of turmeric varies depending on its preparation and the environment. A study found the pH of turmeric powder to be 5.90. However, when acidified, the pH dropped to 3.70. Other sources indicate that turmeric acts as a natural pH indicator, changing color between a pH of approximately 7.4 and 8.6. A turmeric extract or juice made with water is approximately neutral (pH ~7).
Factors Affecting Turmeric's pH:
- Form: Turmeric powder has a different pH than acidified turmeric or a water-based extract.
- Acidification: Adding acid significantly lowers the pH.
- Alkaline Solutions: Adding turmeric to an alkaline solution increases its solubility, suggesting an interaction with pH.
Turmeric as a pH Indicator:
Turmeric's color-changing properties make it useful as a pH indicator. It changes color in solutions with pH values between 7.4 and 8.6, shifting from its typical yellow-orange hue depending on the acidity or alkalinity of the solution.
Summary of pH Values Found in Different Studies:
- Turmeric powder: 5.90
- Acidified turmeric: 3.70
- Water extract: Approximately 7 (neutral)
- pH Indicator Range: 7.4 - 8.6
