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i See Periodic Table A 1.00 L solution contains 21.52 g of nitrous acid, HNO2. What mass of sodium nitrite, NaNO2, should be added to it to make a buffer with a pH of 2.76? K, (HNO2) = 4.0 × 10-4. 143.5 g

i See Periodic Table A 1.00 L solution contains 21.52 g of nitrous acid, HNO2. What mass of sodium nitrite, NaNO2, should be added to it to make a buffer with a pH of 2.76? K, (HNO2) = 4.0 × 10-4. 143.5 g

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Buffers Introduction** A pH buffer is a solution that can minimize changes in pH when small amounts of acid or base are added to it. Control of pH is very important for chemical reactions in living systems. Our blood pH is about 7.4, and changes of a few tenths of a pH unit either way can cause serious health consequences. The blood has a buffer system to help regulate pH. **Diagram Explanation:** The diagram shows the pH scale from 6.6 to 8.0, highlighting various health conditions associated with specific pH levels: - **Death**: pH 6.6 to 6.8 (red zone) - **Acidosis**: pH 7.0 (yellow zone) - **Normal**: pH 7.4 (green zone) - **Alkalosis**: pH 7.6 (yellow zone) - **Death**: pH 8.0 (red zone) --- **Problem Statement:** A 1.00 L solution contains 21.52 g of nitrous acid, HNO₂. What mass of sodium nitrite, NaNO₂, should be added to it to make a buffer with a pH of 2.76? Given: \( K_a \) (HNO₂) = \( 4.0 \times 10^{-4} \) **Attempt:** The calculated mass was 143.5 g, which is incorrect.
Transcribed Image Text:**Buffers Introduction** A pH buffer is a solution that can minimize changes in pH when small amounts of acid or base are added to it. Control of pH is very important for chemical reactions in living systems. Our blood pH is about 7.4, and changes of a few tenths of a pH unit either way can cause serious health consequences. The blood has a buffer system to help regulate pH. **Diagram Explanation:** The diagram shows the pH scale from 6.6 to 8.0, highlighting various health conditions associated with specific pH levels: - **Death**: pH 6.6 to 6.8 (red zone) - **Acidosis**: pH 7.0 (yellow zone) - **Normal**: pH 7.4 (green zone) - **Alkalosis**: pH 7.6 (yellow zone) - **Death**: pH 8.0 (red zone) --- **Problem Statement:** A 1.00 L solution contains 21.52 g of nitrous acid, HNO₂. What mass of sodium nitrite, NaNO₂, should be added to it to make a buffer with a pH of 2.76? Given: \( K_a \) (HNO₂) = \( 4.0 \times 10^{-4} \) **Attempt:** The calculated mass was 143.5 g, which is incorrect.
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