AP Chemistry · Free-response questions 2026

7 questions, each with its course unit and the official scoring guidelines.

Official paper (PDF) · QuestionsAll AP Chem papers→

Question 3

Open answer
Question 3 — 3. Nitrous acid, HNO2, is a weak acid that ionizes according to Equation 1. Equation 1: HNO H O NO H O . K aq l aq aq K 5 6 10 298 × at a 2 2 2 3 4 E + + = - + - ^ ^ ^ ^ h h h h Part A Identify a conjugate acid-base…

Source: College Board — AP Chemistry, Free-response questions, 2026

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