Tomato juice was mixed with red rose extract; the mixture got a tint of red colour. What will happen if Milk of magnesia is added to this mixture? Explain.
Answer variants:
Magnesium hydroxide
red
green
Oxalic acid
Tomato juice contains organic acids like , so it is acidic.
Red rose extract is a natural indicator.
It shows a colour in acidic solutions.
It changes to in basic solutions.
Milk of magnesia is a basic solution because it contains .
When Milk of magnesia is added to the acidic mixture, it changes the medium from acidic to basic (or reduces the acidity sufficiently), causing the red rose extract to change its colour from to .