Write the missing names and molecular formulas for the following reactions between the carbonic acid–bicarbonate buffer system and the bicarbonate reserve.

a. _
b. _
c. ___

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Step 1: Understand the carbonic acid–bicarbonate buffer system. This system helps maintain blood pH by balancing carbonic acid (H2CO3) and bicarbonate ions (HCO3\^-). The key reactions involve the interconversion between CO2, H2CO3, HCO3\^-, and H\^+ ions.

Step 2: Identify the missing names and molecular formulas by recalling the main reactions: (a) the formation of carbonic acid from carbon dioxide and water, (b) the dissociation of carbonic acid into bicarbonate and hydrogen ions, and (c) the reverse reaction where bicarbonate combines with hydrogen ions to form carbonic acid.

Step 3: Write the molecular formulas for each reaction: (a) CO2 + H2O \(\leftrightarrow\) H2CO3, (b) H2CO3 \(\leftrightarrow\) HCO3\^- + H\^+, and (c) HCO3\^- + H\^+ \(\leftrightarrow\) H2CO3.

Step 4: Assign the correct names to each species in the reactions: (a) carbon dioxide and water forming carbonic acid, (b) carbonic acid dissociating into bicarbonate ion and hydrogen ion, and (c) bicarbonate ion combining with hydrogen ion to form carbonic acid.

Step 5: Review the role of the bicarbonate reserve, which refers to the bicarbonate ions available in the blood to neutralize excess acids, maintaining pH balance through these reversible reactions.

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Carbonic Acid–Bicarbonate Buffer System

This buffer system maintains blood pH by balancing carbonic acid (H2CO3) and bicarbonate ions (HCO3-). It regulates acidity through reversible reactions where carbonic acid dissociates into bicarbonate and hydrogen ions, helping to neutralize excess acids or bases.

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Chemical Equilibria in Buffer Systems

Buffer systems rely on equilibrium reactions where reactants and products coexist in a dynamic balance. Understanding the direction and shifts of these equilibria, influenced by changes in pH or concentration, is essential to predict the outcome of reactions in the carbonic acid–bicarbonate system.

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Molecular Formulas and Reaction Naming

Identifying the correct molecular formulas and names of compounds involved in buffer reactions is crucial. This includes recognizing species like CO2, H2CO3, HCO3-, and CO32-, and understanding how they interconvert during acid-base reactions within the bicarbonate reserve.

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