Solubility basics: acidic substances dissolve better at higher pH and vice versa. Example: tea pigmentation, slightly acidic. Compare: normal tea steeping, steeping tea in water with lemon (hint: add lemon AFTER steeping next time!), steeping tea in water with a hint of cheap baking soda added (notice slight taste modification, does that feel familiar? Somebody might save pennies by using less tea to get the color and nothing else in the only drink available). Discuss.
Result: students leave outraged with their canteen, school admin, the government that made this happen.
Awesome! I’ve taught chemistry this way!
Solubility basics: acidic substances dissolve better at higher pH and vice versa. Example: tea pigmentation, slightly acidic. Compare: normal tea steeping, steeping tea in water with lemon (hint: add lemon AFTER steeping next time!), steeping tea in water with a hint of cheap baking soda added (notice slight taste modification, does that feel familiar? Somebody might save pennies by using less tea to get the color and nothing else in the only drink available). Discuss.
Result: students leave outraged with their canteen, school admin, the government that made this happen.