An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
Sample A has a pH of 4, so it is acidic.
Sample B has a pH of 6, so it is also acidic.
Since pH of A < pH of B, sample A is more acidic than sample B.
Therefore, sample A is acidic and sample B is acidic.
Explanation
Problem Analysis We are given two liquid samples, A and B, with pH values of 4 and 6, respectively. Our goal is to determine whether each sample is acidic or alkaline (basic) and to compare their acidity levels.
Understanding pH Scale The pH scale ranges from 0 to 14. A pH of 7 is neutral. Values less than 7 indicate acidity, while values greater than 7 indicate alkalinity (basicity).
Determining Acidity of Sample A Sample A has a pH of 4, which is less than 7. Therefore, sample A is acidic.
Determining Acidity of Sample B Sample B has a pH of 6, which is less than 7. Therefore, sample B is also acidic.
Comparing Acidity Levels Since sample A has a pH of 4 and sample B has a pH of 6, sample A is more acidic than sample B because a lower pH value indicates higher acidity.
Final Answer Therefore, sample A is acidic, and sample B is acidic.
Examples
Understanding pH is crucial in many real-world applications. For example, in agriculture, knowing the pH of the soil helps farmers choose the right crops and fertilizers. In medicine, maintaining the correct pH balance in our blood is essential for our health. Even in cooking, pH affects the taste and texture of food. For instance, adding an acidic ingredient like vinegar can tenderize meat or prevent discoloration in fruits.
Approximately 2.81 × 1 0 21 electrons flow through the device when a current of 15.0 A is delivered for 30 seco n d s . This is calculated based on the total charge and the charge of a single electron.
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