To contrast the two juices based on their pH values, we need to understand how pH relates to the concentration of hydrogen ions (H+) and hydroxide ions (OH-):
- The pH scale ranges from 0 to 14, where lower pH values indicate higher concentrations of H+ ions, and higher pH values indicate lower concentrations of H+ ions.
- A pH of 7 is neutral, values below 7 are considered acidic (higher H+ concentration), and values above 7 are considered basic (higher OH- concentration).
Given the pH ranges:
- Apple juice: 3.35 - 4.0 (more acidic, higher H+ concentration)
- Tomato juice: 4.1 - 4.6 (less acidic, lower H+ concentration)
Now we can analyze the provided statements:
A. Apple juice and tomato juice have the same concentration of hydroxide ions (OH-).
- This is incorrect because the pH values indicate different levels of H+ and consequently different levels of OH-.
B. Apple juice has a higher concentration of hydrogen ions (H+) than tomato juice does.
- This is correct since apple juice (with a lower pH) is more acidic and has a higher concentration of H+ ions compared to tomato juice.
C. Apple juice has a higher concentration of hydroxide ions (OH-) than tomato juice does.
- This is incorrect for the reasons mentioned earlier.
D. Apple juice has a lower concentration of hydrogen ions (H+) than tomato juice does.
- This is incorrect because it goes against the findings (apple juice has a higher concentration of H+).
The correct statement is: B. Apple juice has a higher concentration of hydrogen ions (H+) than tomato juice does.
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