A Chromate Ion Consists Of Four Oxygen Atoms Bonded To A Chromium Atom And Has Two Extra Electrons. What Is The Formula Of This Ion?A. $Cr_4 O^{2-}$B. $CrO_4^{2+}$C. $CrO_4^{2-}$

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Introduction

In chemistry, understanding the structure and properties of ions is crucial for comprehending various chemical reactions and processes. The chromate ion, consisting of four oxygen atoms bonded to a chromium atom and having two extra electrons, is a fundamental concept in inorganic chemistry. In this article, we will delve into the formula of the chromate ion, exploring its composition and properties.

The Composition of the Chromate Ion

The chromate ion is composed of a chromium atom bonded to four oxygen atoms. This arrangement is known as a tetrahedral structure, where the chromium atom is at the center, and the four oxygen atoms are arranged around it in a symmetrical manner. The presence of two extra electrons in the chromate ion is a result of the chromium atom's ability to form covalent bonds with the oxygen atoms.

The Formula of the Chromate Ion

Given the composition of the chromate ion, we can now determine its formula. The formula of an ion is represented by the symbol of the central atom, followed by the number of oxygen atoms bonded to it, and finally, the charge on the ion. In the case of the chromate ion, the central atom is chromium (Cr), and it is bonded to four oxygen atoms (O). The charge on the ion is -2, indicating that it has two extra electrons.

Analyzing the Options

Now that we have determined the formula of the chromate ion, let's analyze the given options:

  • Option A: Cr4O2−Cr_4 O^{2-}: This option suggests that the chromate ion has four chromium atoms bonded to one oxygen atom, which is incorrect.
  • Option B: CrO42+CrO_4^{2+}: This option suggests that the chromate ion has one chromium atom bonded to four oxygen atoms, but it has a +2 charge, which is incorrect.
  • Option C: CrO42−CrO_4^{2-}: This option suggests that the chromate ion has one chromium atom bonded to four oxygen atoms, and it has a -2 charge, which is correct.

Conclusion

In conclusion, the formula of the chromate ion is CrO42−CrO_4^{2-}. This ion consists of a chromium atom bonded to four oxygen atoms in a tetrahedral structure, and it has a -2 charge due to the presence of two extra electrons. Understanding the composition and properties of the chromate ion is essential for comprehending various chemical reactions and processes in inorganic chemistry.

Key Takeaways

  • The chromate ion consists of a chromium atom bonded to four oxygen atoms in a tetrahedral structure.
  • The formula of the chromate ion is CrO42−CrO_4^{2-}.
  • The chromate ion has a -2 charge due to the presence of two extra electrons.

Frequently Asked Questions

  • What is the composition of the chromate ion?
    • The chromate ion consists of a chromium atom bonded to four oxygen atoms in a tetrahedral structure.
  • What is the formula of the chromate ion?
    • The formula of the chromate ion is CrO42−CrO_4^{2-}.
  • What is the charge on the chromate ion?
    • The chromate ion has a -2 charge due to the presence of two extra electrons.

References

  • Atkins, P. W., & De Paula, J. (2010). Physical chemistry (9th ed.). Oxford University Press.
  • Brown, T. E., & LeMay, H. E. (2014). Chemistry: The Central Science (13th ed.). Pearson Education.
  • Petrucci, R. H., Harwood, W. S., & Herring, F. G. (2016). General chemistry: Principles and modern applications (11th ed.). Pearson Education.
    A Comprehensive Guide to the Chromate Ion: Q&A =====================================================

Introduction

In our previous article, we explored the composition and properties of the chromate ion, a fundamental concept in inorganic chemistry. The chromate ion consists of a chromium atom bonded to four oxygen atoms in a tetrahedral structure, and it has a -2 charge due to the presence of two extra electrons. In this article, we will delve into a comprehensive Q&A guide to the chromate ion, addressing common questions and providing detailed explanations.

Q&A Guide

Q1: What is the composition of the chromate ion?

A1: The chromate ion consists of a chromium atom bonded to four oxygen atoms in a tetrahedral structure.

Q2: What is the formula of the chromate ion?

A2: The formula of the chromate ion is CrO42−CrO_4^{2-}.

Q3: What is the charge on the chromate ion?

A3: The chromate ion has a -2 charge due to the presence of two extra electrons.

Q4: What is the significance of the tetrahedral structure in the chromate ion?

A4: The tetrahedral structure in the chromate ion is significant because it allows the chromium atom to form covalent bonds with the oxygen atoms, resulting in a stable ion.

Q5: How does the chromate ion react with other ions?

A5: The chromate ion can react with other ions to form various compounds. For example, it can react with hydrogen ions to form chromic acid, or with sodium ions to form sodium chromate.

Q6: What are some common applications of the chromate ion?

A6: The chromate ion has several common applications, including:

  • Corrosion inhibition: The chromate ion is used as a corrosion inhibitor in various industries, such as construction and automotive.
  • Pigment production: The chromate ion is used as a pigment in the production of various dyes and paints.
  • Water treatment: The chromate ion is used in water treatment processes to remove impurities and contaminants.

Q7: What are some common hazards associated with the chromate ion?

A7: The chromate ion can be hazardous if not handled properly. Some common hazards associated with the chromate ion include:

  • Toxicity: The chromate ion can be toxic if ingested or inhaled.
  • Skin irritation: The chromate ion can cause skin irritation and allergic reactions.
  • Eye damage: The chromate ion can cause eye damage and vision problems.

Q8: How can the chromate ion be safely handled and stored?

A8: The chromate ion can be safely handled and stored by following proper safety protocols, including:

  • Wearing protective gear: Wearing protective gear, such as gloves and goggles, when handling the chromate ion.
  • Using proper containers: Using proper containers and labeling to store the chromate ion.
  • Following disposal procedures: Following proper disposal procedures to prevent environmental contamination.

Conclusion

In conclusion, the chromate ion is a fundamental concept in inorganic chemistry, with a tetrahedral structure and a -2 charge. Understanding the composition and properties of the chromate ion is essential for comprehending various chemical reactions and processes. This Q&A guide provides a comprehensive overview of the chromate ion, addressing common questions and providing detailed explanations.

Key Takeaways

  • The chromate ion consists of a chromium atom bonded to four oxygen atoms in a tetrahedral structure.
  • The formula of the chromate ion is CrO42−CrO_4^{2-}.
  • The chromate ion has a -2 charge due to the presence of two extra electrons.
  • The chromate ion has several common applications, including corrosion inhibition, pigment production, and water treatment.
  • The chromate ion can be hazardous if not handled properly, and proper safety protocols should be followed when handling and storing it.

References

  • Atkins, P. W., & De Paula, J. (2010). Physical chemistry (9th ed.). Oxford University Press.
  • Brown, T. E., & LeMay, H. E. (2014). Chemistry: The Central Science (13th ed.). Pearson Education.
  • Petrucci, R. H., Harwood, W. S., & Herring, F. G. (2016). General chemistry: Principles and modern applications (11th ed.). Pearson Education.