chemistry

what is the ration of water drops to EDTA (ethylenediamene tetraacetic acid) if 3 drops of EDTA was needed to change the color of 20 drops of water with known hardness??

a. 0.15
b. 1.0
c. 4.0
d. 6.7

am I missing something huge here??

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  1. water:Etda::20:3

    D is the answer

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    bobpursley
  2. what about this??


    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

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