Several common masking agents used in EDTA titrations are listed paired with a mixture of two metal ions. Classify each masking agent-metal ion combination by whether the masking agent is capable of masking one of the metal ions and still allowing the other metal ion to react with EDTA or not. Masks one metal ion but not the other triethanolamine: A1³+ and Pb²+ fluoride: Al³+ and Fe³+ cyanide: Ca²+ and Mn²+ Answer Bank Does not mask or masks both metal ions cyanide: Ni²+ and Pb²+ 2,3-dimercapto-1-propanol: B₁³ + and Pb²+ fluoride: Ti4+ and Cd²+

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Several common masking agents used in EDTA titrations are listed paired with a mixture of two metal ions. Classify each
masking agent-metal ion combination by whether the masking agent is capable of masking one of the metal ions and still
allowing the other metal ion to react with EDTA or not.
Masks one metal ion but not the other
triethanolamine: Al³+ and Pb²+
fluoride: Al³+ and Fe³+
cyanide: Ca²+ and Mn²+
Answer Bank
cyanide: Ni²+
2,3-dimercapto-1-propanol: Bi³ + and Pb²+
Does not mask or masks both metal ions
and Pb²+
fluoride: Tit+ and Cd²+
Transcribed Image Text:Several common masking agents used in EDTA titrations are listed paired with a mixture of two metal ions. Classify each masking agent-metal ion combination by whether the masking agent is capable of masking one of the metal ions and still allowing the other metal ion to react with EDTA or not. Masks one metal ion but not the other triethanolamine: Al³+ and Pb²+ fluoride: Al³+ and Fe³+ cyanide: Ca²+ and Mn²+ Answer Bank cyanide: Ni²+ 2,3-dimercapto-1-propanol: Bi³ + and Pb²+ Does not mask or masks both metal ions and Pb²+ fluoride: Tit+ and Cd²+
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