I have two question videos. I debated which to use in class and ultimately chose the first option below.
Option Number 1
In this option, we measure the pH of water and the pH of pure orange juice concentrate.
Option Number 2
In this option, we measure the pH of water and the pH of 100 ml of water mixed with 1 ml of orange juice concentrate.
I imagine that Option 1 will prompt questions such as, “What is the pH of regular orange juice?” and “What if we mix it 50-50?”
I imagine that Option 2 will also prompt the question, “What is the pH of the straight-up concentrate?”
In fact, this last question is the one that motivated this project. I was expecting (as will my students) that the difference between the pH of juice and the pH of concentrate will be quite large.
Juice (20 ml)
This actually doesn’t demonstrate juice (see post where I regret this oversight in my data collection). But it’s pretty close. Real OJ should be 3:1 water to concentrate. This is 5:1.