Iminodiacetic acid (IDA) is often used in ion exchange resins as a way to remove heavy metals from industrial waste waters. It forms a 2:1 complex with many heavy metals, with a high selectivity for divalent over monovalent ions. A 14.50 mL sample of 0.0315 M Ni2+ was added to 14.50 mL of 0.187 M iminodiacetic acid (the completely protonated form is abbreviated as H3A+) buffered at pH 7.00. Given that ?A2− is 4.6×10−3 at pH 7.00, what is the final concentration of Ni2+ remaining in solution? Ni2+(aq)+2A2−(aq)↽−−⇀NiA2−2(aq)?f=2.00×1014   [Ni2+]= __________ M

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Iminodiacetic acid (IDA) is often used in ion exchange resins as a way to remove heavy metals from industrial waste waters. It forms a 2:1 complex with many heavy metals, with a high selectivity for divalent over monovalent ions.

A 14.50 mL sample of 0.0315 M Ni2+ was added to 14.50 mL of 0.187 M iminodiacetic acid (the completely protonated form is abbreviated as H3A+) buffered at pH 7.00. Given that ?A2− is 4.6×10−3 at pH 7.00, what is the final concentration of Ni2+ remaining in solution?

Ni2+(aq)+2A2−(aq)↽−−⇀NiA2−2(aq)?f=2.00×1014

 

[Ni2+]= __________ M

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