Question

1. Calculate the mass of dried Na2H2EDTA•2H2O needed to prepare exactly 100.00mL of a 0.0100 M solution. Then, calculate the mass of CoCl2•6H20 required to react completely with 10.0mL of your 0.0100 M EDTAs solution (include 6 molecules of water in molecular weight calculation)

Answer #1

**Molar mass of the Na2H2EDTA.2H2O = 349.24
g/mol.**

**Molarity = (mass/molar mass) X (1000/volume in
mL)**

**mass of Na2H2EDTA.2H2O = (molarity X molar mass X
100)/1000**

**
= 0.01 X 349.24 X 100/1000**

**
= 0.349 grams.**

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2.
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®
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