Certified Ophthalmic Assistant Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Study for the Certified Ophthalmic Assistant Exam. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

The concentration of a chemical in a pharmaceutical solution is also called the

Osmolality
Osmotic pressure
Tonicity
pKa

The correct answer is: Tonicity

In ophthalmic practice, the concentration of a chemical in a pharmaceutical solution is often referred to as tonicity. Tonicity is a measure of the effective osmotic pressure gradient of two solutions separated by a semipermeable membrane. It is crucial in ophthalmic solutions to ensure that they are isotonic with the tissues of the eye to prevent damage or irritation. Osmolality refers to the concentration of osmotically active particles in a solution. Osmotic pressure is the pressure that must be applied to prevent the flow of solvent across a selectively permeable membrane. pKa is the negative logarithm of the acid dissociation constant of a solution. Therefore, the most relevant term for the concentration of a chemical in a pharmaceutical solution in ophthalmic practice is tonicity.