Answer: The difference in acidity between tomatoes (pH 4) and seawater (pH 8) is 4 pH units.
Step-by-step explanation:
To calculate the difference in acidity between tomatoes (pH 4) and seawater (pH 8), we can subtract the pH values of the two substances. The pH scale is a logarithmic scale, so a difference of 1 pH unit represents a tenfold difference in acidity.
Let's calculate the difference step by step:
pH of tomatoes = 4
pH of seawater = 8
Difference in acidity = pH of tomatoes - pH of seawater
Difference in acidity = 4 - 8
Difference in acidity = -4
Since the difference is negative (-4), it indicates that seawater is more alkaline (less acidic) than tomatoes. Specifically, the difference in acidity between tomatoes (pH 4) and seawater (pH 8) is 4 pH units.