Ionization of Acids and Bases — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Ionization of Acids and Bases.

Impact of temperature on pH and $K_w$

medium

While $pH + pOH = 14$ is standard, NEET could introduce questions where the temperature is not $25^circ C$, requiring students to know that $K_w$ changes with temperature, and thus the neutral pH also changes. This tests a deeper understanding beyond rote memorization of the pH scale. For instance, asking for the pH of pure water at a temperature other than $25^circ C$ where $K_w$ is given.

Relative strength comparison based on molecular structure

high

Beyond just $K_a$ and $K_b$ values, NEET often tests the ability to predict relative acid/base strength based on molecular structure, such as electronegativity of the central atom, bond strength, inductive effects, or resonance stabilization of the conjugate base. For example, comparing the acidity of $HF, HCl, HBr, HI$ or $CH_3COOH$ vs. $ClCH_2COOH$. This requires a qualitative understanding of chemical bonding and effects on proton donation/acceptance.

Calculations involving polyprotic acids (first dissociation only)

medium

While full calculations for polyprotic acids are complex, NEET might ask for the pH of a solution of a polyprotic acid (e.g., $H_2S$, $H_2CO_3$) considering only the first dissociation step, as the second dissociation constant is often much smaller. This combines weak acid pH calculation with the recognition of polyprotic nature. Students need to know to primarily consider the first $K_a$ for pH determination.