Final answer:
The pH of a solution with a H⁻ concentration of 1.7 x 10⁻⁵ M is 4.77.
Step-by-step explanation:
The pH scale measures the concentration of hydrogen ions (H*) in a solution. A solution with a hydrogen ion concentration of 1.7 x 10⁻⁵ M would have a pH value of 4.77. According to the pH scale, a pH value of 7 is neutral, pH values less than 7 are acidic, and pH values greater than 7 are basic. Therefore, the correct answer is D. 4.77.