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In preparing for an exam and I'm trying to solve the following question. I'm clueless. What should I do?

Which of the following water solutions has the highest osmotic pressure?

\begin{align} \tag1 \pu{0.1 mol/kg} &~ \ce{NaCl}\\ \tag2 \pu{0.1 mol/kg} &~ \ce{KF}\\ \tag3 \pu{0.1 mol/kg} &~ \text{sucrose}\\ \tag4 \pu{0.1 mol/kg} &~ \ce{MgCl2} \end{align}

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closed as off-topic by Ivan Neretin, Loong, Martin - マーチン Feb 29 '16 at 11:06

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$\ce{MgCl2}$ has the highest osmotic pressure because it breaks up into three ions in water, as opposed to all the others, which only break up into two.

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