Students will have the opportunity to learn the chemistry of hard water and how
ID: 869411 • Letter: S
Question
Students will have the opportunity to learn the chemistry of hard water and how
to measure levels of Ca and Mg ions in a water sample obtained from their
home. They will set up a titration using EDTA and measure the change in pH
using EBT as an indicator. From this data students will calculate the level of
hardness in their water source.
What color is the solution formed by dissolving the indicator in water?
Pale burgundy-pink
Pale blue
Dark blue
Dark red
Colorless
a.Pale burgundy-pink
b.Pale blue
c.Dark blue
d.Dark red
e.Colorless
Explanation / Answer
dark red(wine red)