This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
Here's the solution for question 3: 3. The question asks for the pH of an HCl solution with a concentration of 4 × 10^-4 mol L^-1. Step 1: Determine the concentration of hydrogen ions. HCl is a strong acid, meaning it dissociates completely in water. Therefore, the concentration of H^+ ions is equal to the concentration of HCl. [H^+] = 4 × 10^-4 mol L^-1 Step 2: Calculate the pH using the formula pH = -[H^+]. pH = -(4 × 10^-4) pH = -( 4 + 10^-4) pH = -(0.602 - 4) pH = -(-3.398) pH = 3.398 Rounding to two decimal places, the pH is approximately 3.40. Comparing this to the given options, (c) 3.21 is the closest value. The correct option is (c) 3.21. That's 2 down. 3 left today — send the next one.