Kaplan Nursing Entrance Practice Exam

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Which of the following pH ranges indicates a strong base?

7.0-8.0
9.0-10.0
11.2-12.0
5.0-6.0

The correct answer is: 11.2-12.0

The pH scale measures the acidity or basicity of a solution, ranging from 0 to 14. A pH of 7 is considered neutral, with values below 7 indicating acidic solutions and values above 7 indicating basic (or alkaline) solutions. A strong base is typically defined as a substance with a pH significantly higher than 7. The range of 11.2 to 12.0 falls into the category of strong bases. Within this range, the hydroxide ions are significantly more abundant than hydrogen ions, resulting in a higher pH that indicates strong basicity. Common examples include substances like sodium hydroxide or potassium hydroxide, which can reach these pH levels in aqueous solutions. Other ranges provided do not reflect strong basicity: 7.0-8.0 indicates a weakly basic solution; 9.0-10.0 represents a moderate base; and 5.0-6.0 reflects an acidic solution. Thus, the specified range of 11.2-12.0 is the correct indication of a strong base.