Label each of the following as being a strong base, a weak base, or a species with negligible basicity. In each case write the formula of its conjugate acid, and indicate whether the conjugate acid is a strong acid, a weak acid, or a species with negligible acidity: (b) HCO3-

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Step 1: Identify the given species. In this case, we have HCO3-, which is the bicarbonate ion.

Step 2: Determine the basicity of the given species. HCO3- is a weak base because it does not completely dissociate in water.

Step 3: Write the formula of its conjugate acid. The conjugate acid of a base is formed by adding a proton (H+) to the base. Therefore, the conjugate acid of HCO3- is H2CO3.

Step 4: Determine the acidity of the conjugate acid. H2CO3 is a weak acid because it does not completely ionize in water.

Step 5: Summarize the findings. HCO3- is a weak base and its conjugate acid, H2CO3, is a weak acid.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Acid-Base Theory

Acid-base theory explains the behavior of acids and bases in chemical reactions. According to the Brønsted-Lowry theory, acids are proton donors, while bases are proton acceptors. This framework helps classify substances based on their ability to donate or accept protons, which is essential for determining the strength of acids and bases.

Conjugate Acid-Base Pairs

A conjugate acid-base pair consists of two species that differ by the presence of a proton (H+). When a base accepts a proton, it forms its conjugate acid, while the acid that donates the proton forms its conjugate base. Understanding these pairs is crucial for predicting the strength of acids and bases, as strong acids have weak conjugate bases and vice versa.

Strength of Acids and Bases

The strength of an acid or base is determined by its ability to dissociate in water. Strong acids, like HCl, completely dissociate into ions, while weak acids, like acetic acid, only partially dissociate. Similarly, strong bases fully dissociate in solution, whereas weak bases do not. This concept is vital for classifying substances like HCO3- and its conjugate acid, H2CO3.