What is the range of the PH scale?

Appeared in: UP CHO - 2018

Explanation

The pH scale is a universally accepted measure in chemistry and biology to specify the acidity or basicity of an aqueous solution.
The scale conventionally ranges from 0 to 14.
A pH value of 7 is considered neutral (like pure water).
Values less than 7 indicate acidity, with 0 being the most acidic.
Values greater than 7 indicate alkalinity (or basicity), with 14 being the most alkaline.

Option B: This option incorrectly omits the lower end of the scale. Very strong acids can have a pH between 0 and 1.
Option C: This option incorrectly truncates the upper end of the scale. Strong bases can have pH values between 12 and 14.
Option D: This range only represents the acidic half of the pH scale, completely omitting the neutral point (7) and the entire alkaline range (7 to 14).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Range and principles of the pH scale as background academic context rather than a clinical decision trigger.
A nurse must understand the pH scale to interpret Arterial Blood Gas (ABG) results. The normal blood pH is tightly controlled between 7.35 and 7.45.
A blood pH below 7.35 indicates acidosis, and a pH above 7.45 indicates alkalosis. Both are serious conditions requiring immediate nursing intervention.
Understanding pH is also vital for medication administration, as the pH of a solution can affect drug stability and absorption.

How to Approach the Question

This is a factual recall question that tests your fundamental knowledge of a basic scientific concept.
First, identify the core concept: the pH scale.
Recall the standard definition and range of this scale from your studies.
Evaluate each option against this recalled knowledge.
Option A (0 to 14) matches the standard scientific definition of the pH scale's range.
Eliminate the other options by identifying how they are incomplete or incorrect. For example, '0 to 7' only covers the acidic part.

Concept Tested & Keywords

Q7D_bdayXD8r5uWx8VnTlR

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 54-56

E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 65-80

E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 2 — Subpart A (pp 1-239 of 478) p. 70-72

Practise the full UP CHO - 2018

Attempt every question from this paper in a timed mock, then review the full solution for each one.