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Consider the following information about sulfurous acid, a diprotic acid (H-SO3). H2SO3 = HSO,+H pKa1= 1.81 HSO,= SO,-+ H pK2=6.91 The titration curve for sodium sulfite, NazSO3, with standard HCl is shown below: pH V1 V2 mL HCl added What are the major species present at point 1? Stop tharing 2.

Consider the following information about sulfurous acid, a diprotic acid (H-SO3). H2SO3 = HSO,+H pKa1= 1.81 HSO,= SO,-+ H pK2=6.91 The titration curve for sodium sulfite, NazSO3, with standard HCl is shown below: pH V1 V2 mL HCl added What are the major species present at point 1? Stop tharing 2.

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ISBN:9781305957404
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Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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### Titration of Sulfite Ion with Hydrochloric Acid #### Background Information on Sulfurous Acid Sulfurous acid (H₂SO₃) is a diprotic acid, meaning it can release two protons (H⁺) during dissociation. The dissociation occurs in two steps, each with its own dissociation constant (pKa): 1. **First Dissociation**: \[ \text{H}_2\text{SO}_3 \rightleftharpoons \text{HSO}_3^- + \text{H}^+ \] \[ \text{pKa}_1 = 1.81 \] 2. **Second Dissociation**: \[ \text{HSO}_3^- \rightleftharpoons \text{SO}_3^{2-} + \text{H}^+ \] \[ \text{pKa}_2 = 6.91 \] #### Titration Curve Analysis The titration curve for sodium sulfite (Na₂SO₃) with standard hydrochloric acid (HCl) is depicted in the graph below. ![Titration Curve](image-link-placeholder) ##### Graph Explanation - **Axes**: - The y-axis represents the pH of the solution. - The x-axis represents the volume of HCl added, in milliliters (mL). - **Data Points**: - The graph shows several key points marked as 1, 2, 3, 4, and 5, each corresponding to significant stages in the titration process. - **Titration Stages**: - **V1**: The volume of HCl required to reach the first equivalence point. - **V2**: The volume of HCl required to reach the second equivalence point. - **Curve Description**: - **Point 1**: Represents the initial state before significant HCl addition. - **Point 2**: Indicates an equivalence point where the amount of HCl added equals the amount of the first dissociation of H₂SO₃. - **Point 3**: Represents an intermediate stage after the first equivalence point but before the second equivalence point. - **Point 4**: Denotes the second equivalence point where the amount of HCl added equals the amount of
Transcribed Image Text:### Titration of Sulfite Ion with Hydrochloric Acid #### Background Information on Sulfurous Acid Sulfurous acid (H₂SO₃) is a diprotic acid, meaning it can release two protons (H⁺) during dissociation. The dissociation occurs in two steps, each with its own dissociation constant (pKa): 1. **First Dissociation**: \[ \text{H}_2\text{SO}_3 \rightleftharpoons \text{HSO}_3^- + \text{H}^+ \] \[ \text{pKa}_1 = 1.81 \] 2. **Second Dissociation**: \[ \text{HSO}_3^- \rightleftharpoons \text{SO}_3^{2-} + \text{H}^+ \] \[ \text{pKa}_2 = 6.91 \] #### Titration Curve Analysis The titration curve for sodium sulfite (Na₂SO₃) with standard hydrochloric acid (HCl) is depicted in the graph below. ![Titration Curve](image-link-placeholder) ##### Graph Explanation - **Axes**: - The y-axis represents the pH of the solution. - The x-axis represents the volume of HCl added, in milliliters (mL). - **Data Points**: - The graph shows several key points marked as 1, 2, 3, 4, and 5, each corresponding to significant stages in the titration process. - **Titration Stages**: - **V1**: The volume of HCl required to reach the first equivalence point. - **V2**: The volume of HCl required to reach the second equivalence point. - **Curve Description**: - **Point 1**: Represents the initial state before significant HCl addition. - **Point 2**: Indicates an equivalence point where the amount of HCl added equals the amount of the first dissociation of H₂SO₃. - **Point 3**: Represents an intermediate stage after the first equivalence point but before the second equivalence point. - **Point 4**: Denotes the second equivalence point where the amount of HCl added equals the amount of
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