Lesson plan

Sour chemistry

Predict how sour juices are by their chemical reaction with baking soda, then use sour candy in a baking soda test. Look at taste buds.
Science content
Biology: Sensing, Organ Systems (4, 5, 6)
Chemistry: States of Matter, Properties of Materials (K-7)
Chemistry: Atoms, Molecules (3-7)
Chemistry: Chemical Changes (2, 7)

Make the orange soda drink, using molecular models to figure out the chemical reaction.
Add baking soda to other juices, and correlate the amount of gas made with how many H atoms they contain.
Introduce the concept of something sour as something that has a lot of H atoms.
Students taste regular and sour skittles (or other candy) then predict and find out how many gas bubbles each will make with baking soda, OR add baking soda to skittles and predict which ones are the sour skittles (make the most bubbles).
End with looking at taste buds, which detect the H atoms in sour foods.


Brock: soda drink, test other juices, sour candy bubbling, then taste bud observation
Seymour: soda drink, experimenting with different juices, then sour candy bubbling

Grades taught
Gr 4
Gr 5
Gr 6
Gr 7