Final answer:
The pH of a 0.0015 M HCl solution is 2.82, as HCl is a strong acid that dissociates completely in water.
Step-by-step explanation:
The question requires calculating the pH of a 0.0015 M HCl solution. Hydrochloric acid (HCl) is a strong acid, which means it dissociates completely in water. To find the pH, you can use the formula:
pH = -log [H3O+]
In the case of HCl, the concentration of hydronium ions [H3O+] is equal to the concentration of HCl because it dissociates completely. Therefore, the pH is calculated as:
pH = -log [0.0015]
To solve this, you can enter the numbers into a scientific calculator to get:
pH = -log [0.0015] = 2.82
So, the correct answer is (a) 2.82.