How Blood Works The buffer system found in blood works to maintain the pH of blood at a pH range between 7.35 and 7.45. If the buffer system is overwhelmed and the pH value of blood goes above 7.45, would occur.
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The pH of a solution is a measure of its acidity or alkalinity. A pH of 7 is considered neutral, while values below 7 indicate acidity and values above 7 indicate alkalinity. A buffer system is a solution that resists changes in pH when small amounts of acid or base are added to it. It consists of a weak acid and its conjugate base, or a weak base and its conjugate acid. The buffer system works by accepting or donating protons (H+) to maintain the pH within a certain range. In the case of blood, the bicarbonate buffer system plays a crucial role in maintaining its pH around 7.4. Carbonic acid (H2CO3) is a weak acid that can donate a proton to become bicarbonate ion (HCO3-), which acts as a conjugate base. Similarly, bicarbonate ion can accept a proton to form carbonic acid. This reversible reaction helps to regulate the pH of blood. Saliva also has a buffering capacity, with a pH around 6.4. It contains bicarbonate ions and other components that help maintain its pH within a certain range. In summary, buffer systems are important for maintaining the pH of solutions, such as blood and saliva, within a specific range. They consist of a weak acid and its conjugate base, or a weak base and its conjugate acid, which can accept or donate protons to resist changes in pH.
Adi S.
Human blood is slightly basic in nature with a normal pH range of 7.35-7.45. The blood pH is maintained by the carbonic acid-bicarbonate buffer system, shown by the following equilibrium reaction: H2CO3 + H2O ⇌ H3O+ + HCO3-. a) If you add a small amount of an acid to this buffer, then which component of the carbonic acid-bicarbonate buffer will react with the added acid? Explain. b) If you add a small amount of a base to this buffer, then which component of the carbonic acid-bicarbonate buffer will react with the added base? Explain. c) Why the pH of buffer solution remains constant when a small amount of acid or base is added to it?
Sri K.
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