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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250 mL of a 1 M NaOH solution.
2). The mass of potassium hydrogen phthalate (KHP) required to
react with 25 mL of a 1 M NaOH solution. The molecular weight of
KHP is 204.23 g/mol.
3). The amount of water required to dissolve the quantity of KHP
calculated in (b), given that the solubility of KHP is 10.2 grams
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calculate the mass (g) of sodium sulfate needed to prepare
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a)Type the calculation performed to determine the mass of sodium
sulfate necessary to prepare the 0.028 M stock solution. Report the
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b)Report the actual mass of sodium sulfate used to prepare the
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1. The mass of [Al(H2O)6]Cl3
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0.21g
0.1338g
0.6038g
2.
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0.21g
0.1338g
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1. Given the following reaction
2C2H6(l)
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®
4CO2(g)
+
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5-8)
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I2 + 3
F2
® 2 IF3
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