Year 4&5 used the dye from red cabbage to test whether different items were Acid or Alkali. The dark blue water of the red cabbage will change to bright pink if an item is Acid and will change to a green/purple colour if the item is Alkali. They tested toothpaste, hand soap, lemon juice, vinegar, washing up liquid and tap water. Do you know which items are acid or alkali? There is one ‘trick’ item which is neutral – do you know which one it is?
Acid or Alkali?
Posted in Year 4 & 5