1. The problem statement, all variables and given/known data If the ph of battery acid should be 0.8, what is the pH of the acid in a battery that is one-fifth as acidic as it should be? 2. Relevant equations 3. The attempt at a solution We just learned how to comparing pH in Geometric unit, using the formula 10^(ph1-ph2). But for this question, do we really need to use that formula, or we just 0.8/5=0.16? ty!