Ch.21 - Transition Elements and Coordination Chemistry

McMurry8th EditionChemistryISBN: 9781292336145Not the one you use?Change textbook

McMurry 8th Edition

Ch.21 - Transition Elements and Coordination Chemistry

Problem 21.76

Chapter 21, Problem 21.76

What role does EDTA^4-play as a trace additive to mayonnaise? Would the glycinate ion (H₂NCH₂CH₂NH₂) be an effective substitute for EDTA^4-?

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EDTA4- (ethylenediaminetetraacetic acid) is a chelating agent. It binds to metal ions, which prevents them from participating in reactions that could spoil the food. In the case of mayonnaise, EDTA4- binds to metal ions that could catalyze the oxidation of unsaturated fats, leading to rancidity.

The effectiveness of a chelating agent depends on its ability to form stable complexes with metal ions. EDTA4- is a hexadentate ligand, meaning it can form six bonds with a central metal ion. This results in a very stable complex, which is why EDTA4- is such an effective chelating agent.

The glycinate ion (H2NCH2CH2NH2) is a bidentate ligand, meaning it can form two bonds with a central metal ion. While it can act as a chelating agent, it will not form complexes as stable as those formed by EDTA4-.

Therefore, while the glycinate ion could potentially substitute for EDTA4- in mayonnaise, it would not be as effective at preventing spoilage.

Finally, it's important to note that any potential substitute for EDTA4- would also need to be safe for human consumption and not affect the taste or texture of the mayonnaise.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Chelation

Chelation is a chemical process where a molecule binds to a metal ion, forming a stable complex. EDTA4- is a chelating agent that effectively sequesters metal ions, preventing them from catalyzing undesirable reactions in food products like mayonnaise. This helps in preserving the quality and extending the shelf life of the product.

Trace Additives

Trace additives are substances added in small amounts to food products to enhance their stability, safety, or nutritional value. In the case of mayonnaise, EDTA4- serves as a trace additive to inhibit oxidation and microbial growth by binding metal ions that could promote spoilage. Understanding the role of these additives is crucial for food chemistry.

Glycinate Ion Properties

The glycinate ion (H2NCH2CH2NH2) is an amino acid derivative that can also act as a chelating agent, but its effectiveness compared to EDTA4- may vary. While glycinate can bind to certain metal ions, it may not form as stable or strong complexes as EDTA4-, making it less effective as a substitute in preserving food products like mayonnaise.

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What is the oxidation state of the metal in each of the complexes?

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Textbook Question

The glycinate anion, gly-= NH₂CH₂CO₂ ^-, bonds to metal ions through the N atom and one of the O atoms. Using to represent gly-, sketch the structures of the four stereoisomers of Co(gly)₃.

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What is the oxidation state of the metal in each of the complexes?

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Textbook Question

Which of the following complexes can exist as enantiomers? Draw their structures.