Use the figure above to answer the following question.
-The figure suggests that the biological pH values displayed in the graph (are) ________________
A) indicate an absence of hydrogen ions
B) in the extremely acid range
C) range from 1.5 to 8
D) indicate an absence of hydroxide ions
E) in the extremely alkaline range

Question

Use the figure above to answer the following question.
-The figure suggests that the biological pH values displayed in the graph (are) ________________
A) indicate an absence of hydrogen ions 
B) in the extremely acid range 
C) range from 1.5 to 8 
D) indicate an absence of hydroxide ions 
E) in the extremely alkaline range

Quizplus · Accepted Answer

The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 are acidic, and values above 7 are alkaline (basic). A range from 1.5 to 8 encompasses acidic conditions (below 7) and slightly alkaline conditions (just above 7), but not the extremes of either. This indicates the presence of both hydrogen ions (in acidic conditions) and hydroxide ions (in alkaline conditions), ruling out options A and D. The range is not exclusively in the extremely acid or alkaline ranges, ruling out B and E.

Use the Figure Above to Answer the Following Question