A aqueous solution of at exerts an osmotic pressure of exactly . What is the apparent percentage ion — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

The theoretical osmotic pressure $\pi_{ideal} = CRT = 0.1 \times 0.082 \times 300 = 2.46\text{ atm}$. Experimental $\pi = 4.92\text{ atm}$. Thus $i = 4.92 / 2.46 = 2.0$. For $MgCl_2$, $n=3$. Using $i = 1 + \alpha(n-1) \implies 2 = 1 + 2\alpha \implies 2\alpha = 1 \implies \alpha = 0.50$, which is $50\%$.