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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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smokebomb13 smokebomb13
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11 years ago
Suppose a 25.0 mL sample of a solution containing calcium ion required 27.2 mL of 0.2053 M EDTA solution to reach an Eriochrome Black T endpoint. Calculate the molarity of calcium ion in the sample and the number of milligrams of calcium contained in the sample.
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#1
11 years ago
EDTA reacts mole for mole with Ca2+
There are 0.2053 X 0.0272 moles of EDTA
This is the number of moles of Ca2+
multiply by molecular mass Ca to determine grams
The 25ml contains this number of moles.  hence the molarity is the number of moles times 1000/25.
Here is a ref:
http://www.chem.pdx.edu/~atkinsdb/teach/321/EDTA.pdf
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