Final answer:
A universal indicator turning blue usually indicates a moderately alkaline substance with a pH around 7.6 to 7.8, not the highly alkaline pH range of 13-14.
Step-by-step explanation:
If a universal indicator turns blue, the pH is not in the range of 13-14. A universal pH indicator changes colors across the pH scale. Blue typically occurs at moderately alkaline pH levels, around pH 7.6 to 7.8, not at the highly alkaline range of 13-14. When a universal indicator turns a blue color, it generally indicates that the substance is only slightly basic. In solutions with a pH range of 9-10, the color change would be greenish-blue. A pH of 13-14 would usually turn the indicator purple, symbolizing a very strong base.