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what is the ratio of water drops to EDTA if 2 drops of EDTA was needed to change the color of 20 drops of water with unknown hardness?

a. 10
b. 5
c. 0.1
d. 1.0

  • chemistry -

    Bob Pursley answered below.

  • chemistry -

    Bob pursle answered a very similar question this one has 2 drops and unknown hardness...

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