Final answer:
In a respiratory problem, pH and PaCO₂ have an inverse relationship.
Step-by-step explanation:
The relationship between pH and PaCO₂ in a respiratory problem is an inverse relationship.
pH is a measure of the acidity or alkalinity of a solution, while PaCO₂ refers to the partial pressure of carbon dioxide in the blood.
When there is a respiratory problem, such as hypoventilation or hyperventilation, it affects the levels of carbon dioxide in the blood.
As PaCO₂ increases, the pH of the blood decreases, resulting in acidosis. On the other hand, if PaCO₂ decreases, the pH of the blood increases, leading to alkalosis.