Question
14. Samantha used a pH sensor to test different solutions. She dipped the probe of the sensor into each solution and recorded the pH value in a table. Which statement best summarizes how Samantha can classify the solutions as acids or bases using the pH scale? Acids have a pH of 7, while bases have a pH above 7. Acids have a pH above 7, while bases have a pH below 7. Acids have a lower pH than bases, with a pH lower than 7. Acids have a higher pH than bases, with a pH higher than 7. if Calculator
Answer
4
(188 Votes)
Alice
Veteran · Tutor for 12 years
Answer
To classify the solutions as acids or bases using the pH scale, we need to understand the pH scale itself:- A pH of 7 is considered neutral, which is the pH of pure water at 25°C.- A pH lower than 7 indicates an acidic solution.- A pH higher than 7 indicates a basic (alkaline) solution.Now, let's evaluate the statements given:1. "Acids have a pH of 7, while bases have a pH above 7." - This statement is incorrect because a pH of 7 is neutral, not acidic.2. "Acids have a pH above 7, while bases have a pH below 7." - This statement is incorrect because it reverses the properties of acids and bases.3. "Acids have a lower pH than bases, with a pH lower than 7." - This statement is correct. Acids have a pH lower than 7, and bases have a pH higher than 7.4. "Acids have a higher pH than bases, with a pH higher than 7." - This statement is incorrect because it suggests that acids have a higher pH than bases, which is the opposite of the true relationship.The correct statement that best summarizes how Samantha can classify the solutions as acids or bases using the pH scale is:Acids have a lower pH than bases, with a pH lower than 7.Final Answer: Acids have a lower pH than bases, with a pH lower than 7.