Phosphoric acid (H₂PO4) is a polyprotic acid. Write balanced chemical equations for the sequence of reactions that phosphoric acid can undergo when it's dissolved in water. 0 0- 10 S A 0 0 4 X
Phosphoric acid (H₂PO4) is a polyprotic acid. Write balanced chemical equations for the sequence of reactions that phosphoric acid can undergo when it's dissolved in water. 0 0- 10 S A 0 0 4 X
World of Chemistry, 3rd edition
3rd Edition
ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Chapter8: Reactions In Aqueous Solutions
Section8.2: Other Reactions In Aqueous Solutions
Problem 2RQ
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Question
![**Title: A Polyprotic Acid: Phosphoric Acid Dissolution in Water**
**Introduction:**
Phosphoric acid (H₃PO₄) is a common example of a polyprotic acid, which means it can donate more than one proton (H⁺) in aqueous solutions. When dissolved in water, phosphoric acid undergoes a series of dissociation reactions. Each step involves the loss of a proton, resulting in the formation of different ionic species. Understanding these dissociation reactions is essential for comprehending the acid's behavior in various chemical processes.
**Balanced Chemical Equations for the Dissociation of Phosphoric Acid:**
_Phase 1:_
1. **Initial Dissociation:**
\[
\text{H}_3\text{PO}_4 \rightarrow \text{H}^+ + \text{H}_2\text{PO}_4^-
\]
_Phase 2:_
2. **Second Dissociation:**
\[
\text{H}_2\text{PO}_4^- \rightarrow \text{H}^+ + \text{HPO}_4^{2-}
\]
_Phase 3:_
3. **Third Dissociation:**
\[
\text{HPO}_4^{2-} \rightarrow \text{H}^+ + \text{PO}_4^{3-}
\]
Each dissociation step involves the release of a proton into the solution, progressively increasing the solution's acidity.
**Graphical Representation:**
The diagram or graphical interface shown (a schematic depiction of checkboxes beside chemical reaction equations and icons potentially representing interaction tools) is designed to help users visually and interactively validate their understanding of the sequential dissociation reactions.
1. **Checkboxes:** Represent steps or stages of the dissociation that the user can select.
2. **Icons:** Likely functional buttons for interaction.
- The **"X" icon** probably indicates a reset or clear function.
- The **circular arrow icon** might be for reattempt or refresh.
- The **question mark ("?") icon** could be a help or hint button to assist users who need additional guidance.
**Conclusion:**
Understanding the complete dissociation sequence of polyprotic acids like phosphoric acid is crucial for applications in chemistry education and various industrial processes. This structured approach using balanced chemical equations helps in the](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1c542873-90da-4d8f-af03-4e4a6198699f%2F1b0954bb-e6b9-4cd1-b598-4c7a27c832d8%2Fwho4p7a_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Title: A Polyprotic Acid: Phosphoric Acid Dissolution in Water**
**Introduction:**
Phosphoric acid (H₃PO₄) is a common example of a polyprotic acid, which means it can donate more than one proton (H⁺) in aqueous solutions. When dissolved in water, phosphoric acid undergoes a series of dissociation reactions. Each step involves the loss of a proton, resulting in the formation of different ionic species. Understanding these dissociation reactions is essential for comprehending the acid's behavior in various chemical processes.
**Balanced Chemical Equations for the Dissociation of Phosphoric Acid:**
_Phase 1:_
1. **Initial Dissociation:**
\[
\text{H}_3\text{PO}_4 \rightarrow \text{H}^+ + \text{H}_2\text{PO}_4^-
\]
_Phase 2:_
2. **Second Dissociation:**
\[
\text{H}_2\text{PO}_4^- \rightarrow \text{H}^+ + \text{HPO}_4^{2-}
\]
_Phase 3:_
3. **Third Dissociation:**
\[
\text{HPO}_4^{2-} \rightarrow \text{H}^+ + \text{PO}_4^{3-}
\]
Each dissociation step involves the release of a proton into the solution, progressively increasing the solution's acidity.
**Graphical Representation:**
The diagram or graphical interface shown (a schematic depiction of checkboxes beside chemical reaction equations and icons potentially representing interaction tools) is designed to help users visually and interactively validate their understanding of the sequential dissociation reactions.
1. **Checkboxes:** Represent steps or stages of the dissociation that the user can select.
2. **Icons:** Likely functional buttons for interaction.
- The **"X" icon** probably indicates a reset or clear function.
- The **circular arrow icon** might be for reattempt or refresh.
- The **question mark ("?") icon** could be a help or hint button to assist users who need additional guidance.
**Conclusion:**
Understanding the complete dissociation sequence of polyprotic acids like phosphoric acid is crucial for applications in chemistry education and various industrial processes. This structured approach using balanced chemical equations helps in the
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