Ethylene diamine tetra-acetic acid (EDTA) is a water soluble compound that readily combines with metals such as calcium, magnesium, and iron. The molecular formula for EDTA is C10N2O8H16. One EDTA molecule complexes (associates with) one metal atom. A factory produces an aqueous waste that contains 20 mg/L calcium and collects the waste in 44-gallon drum. What mass of EDTA would need to be added to each drum to completely complexes all of the calcium in the barrel?

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Chemistry

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2 May, 20:14

Ethylene diamine tetra-acetic acid (EDTA) is a water soluble compound that readily combines with metals such as calcium, magnesium, and iron. The molecular formula for EDTA is C10N2O8H16. One EDTA molecule complexes (associates with) one metal atom. A factory produces an aqueous waste that contains 20 mg/L calcium and collects the waste in 44-gallon drum. What mass of EDTA would need to be added to each drum to completely complexes all of the calcium in the barrel?

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Morgan Blackburn · Answer 1

There should be added 24.33g of EDTA

Explanation:

EDTA + Ca2 + → Ca (EDTA)

MM of EDTA = 292.24g/mole

MM of Ca2 + = 40g/mole

An aqueos waste contains 20 mg/L Calcium, and collects the waste in 44 gallon drums.

The concentration of Ca2 + ions = 20mg/L = 0.02g/L

We know 1 gallon = 3.785L

The mass of calcium ions is in 44 gallons

⇒44 gallons = 3.785 * 44 = 166.54 L

Since the aqueous waste contains 0.02g/L calcium

in 44 gallons or 166.54 L ⇒ 166.54 * 0.02g = 3.308g

MM of Ca2 + = 40g/mole

⇒40g of Ca2 + reacts with 292.24g of EDTA

⇒ (292.24/40) * 3.308g = 24.33 g

There should be added 24.33g of EDTA