Indicate whether each of the following solvents is protic or aprotic:
a. chloroform (CHCl₃)
b. diethyl ether

Verified step by step guidance

Step 1: Understand the difference between protic and aprotic solvents. Protic solvents have hydrogen atoms bonded to electronegative atoms (like oxygen or nitrogen), which can participate in hydrogen bonding. Aprotic solvents lack such hydrogen atoms and cannot form hydrogen bonds.

Step 2: Analyze chloroform (CHCl₃). Chloroform contains hydrogen atoms bonded to carbon, not to an electronegative atom like oxygen or nitrogen. Therefore, it cannot participate in hydrogen bonding and is classified as an aprotic solvent.

Step 3: Analyze diethyl ether (C₂H₅OC₂H₅). Diethyl ether has oxygen atoms, but the hydrogens in the molecule are bonded to carbon atoms, not to the oxygen. Since it cannot form hydrogen bonds, it is also classified as an aprotic solvent.

Step 4: Summarize the findings: Both chloroform and diethyl ether are aprotic solvents because neither contains hydrogen atoms bonded to electronegative atoms capable of hydrogen bonding.

Step 5: Apply this concept to other solvents by checking for the presence of hydrogen atoms bonded to electronegative atoms (protic) or their absence (aprotic).

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Key Concepts

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

Protic Solvents

Protic solvents are those that have a hydrogen atom attached to an electronegative atom, typically oxygen or nitrogen, allowing them to form hydrogen bonds. This characteristic enables protic solvents to donate protons (H+) in chemical reactions, which is crucial for understanding their reactivity and solvation properties. Common examples include water and alcohols.

Aprotic Solvents

Aprotic solvents lack hydrogen atoms bonded to electronegative atoms, meaning they cannot donate protons. These solvents can still solvate ions and molecules but do so through dipole interactions rather than hydrogen bonding. Examples include acetone and dimethyl sulfoxide (DMSO), which are often used in reactions where protic solvents would interfere.

Solvent Polarity

The polarity of a solvent is determined by its molecular structure and the distribution of electrical charge. Polar solvents, which include many protic solvents, can stabilize ions and polar molecules, while nonpolar or aprotic solvents are better suited for dissolving nonpolar substances. Understanding solvent polarity is essential for predicting solubility and reactivity in organic reactions.

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