EDTA Titrations Shown below are common masking agents used in EDTA titrations, p
ID: 546106 • Letter: E
Question
EDTA Titrations
Shown below are common masking agents used in EDTA titrations, paired with a mixture of two metal ions. Sort each masking agent-metal ion combination by whether the masking agent is capable of masking one of the metal ions while still allowing the other metal ion to react with EDTA or not Masks one metal ion but not the other Doesn't mask or masks both metal ions Triethanolamine: Fe and Mn2 Cyanide: Zn2* and Ca2 Fluoride: Be? and Cu2 2,3-dimercapto-1-propanol: Hg2 and AFluoride: l3+ an F Cyanide: Mg2 and Ca2tExplanation / Answer
Masking agent protects some component of analyte from reacting ith EDTA
Triethanolamine : Masks both the metals.i.e. Fe3+ and Mn2+
Cyanide : Masks metal Zn2+ but not metal Ca2+
Fluoride : Masks metal Be2+ but not metal Cu2+
2,3-dimercapto-1-propanol : Masks metalHg2+ but don't Mask Al3+
Fluoride : Masks metal Fe3+ but not metal Al3+
Cyanide : Does not Mask both the metals Mg2+ and Ca2+
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