Question

Solutions having the same osmotic pressure are called:

• A. Hypertonic
• B. Hypotonic
• C. Isotonic
• D. Normal

Hint:

Equal osmotic pressure $\Rightarrow$ Isotonic. This concept is widely used in biological systems and intravenous fluid preparations.

Answer 1

The Correct Option is C

Concept: Osmotic pressure is the pressure that must be applied to a solution to prevent the flow of solvent through a semipermeable membrane. According to van't Hoff equation, \[ \pi = CRT \] where \[ \pi = \text{osmotic pressure} \] \[ C = \text{molar concentration} \] \[ R = \text{gas constant} \] \[ T = \text{absolute temperature} \] Solutions are classified based on comparison of osmotic pressures.

Step 1: Define isotonic solutions. When two solutions possess identical osmotic pressure at the same temperature, they are called isotonic solutions. Mathematically, \[ \pi_1=\pi_2 \]

Step 2: Understand other terms. Hypertonic solution: \[ \pi_{\text{solution}}>\pi_{\text{reference}} \] Hypotonic solution: \[ \pi_{\text{solution}}<\pi_{\text{reference}} \] Therefore these terms do not represent equal osmotic pressure.

Step 3: Select the correct answer. Solutions having the same osmotic pressure are called: \[ \boxed{\text{Isotonic Solutions}} \] Hence the correct option is \[ \boxed{(C)} \]