Learning Objectives 15.3 The pH Scale Calculate pH, POH, hydronium ion concentration, hydroxide ion concentration for a strong acid or base. Know how to use your calculator. 15.4 Strong Acids and Bases Differentiate between strong and weak acids and bases. 15.5 Weak Acids and Acid lonization Constants Calculate pH. Consider the following acid solutions: 1. 500 mL of a 0.00100 M HCI 2. 500 mL of a 0.100 M acetic acid solution (CH3COOH; Ka = 1.8 x 10-5) Your friend in class claims: The HCl solution will be more acidic. 1) How would you characterize or describe the acids? What calculations might you do to determine if the claim is correct or incorrect? (Do them here.) Is your friend correct or incorrect? Which solution is more acidic? Reasoning: (Write out in detail whether you believe your friend is correct or incorrect and include any evidence that you think necessary to convince the reader that you are correct.)