What colour does tomato juice turn phenolphthalein?

Here's why:

* Phenolphthalein is a pH indicator. It's colorless in acidic solutions and turns pink in basic (alkaline) solutions.

* Tomato juice is slightly acidic. However, the acidity of tomato juice is not strong enough to keep phenolphthalein colorless.

* The pH of tomato juice is typically around 4.0 to 4.5. This is slightly acidic, but it's still within the range where phenolphthalein will turn pink.

Therefore, when you add phenolphthalein to tomato juice, it will turn a light pink color.