Solutions and Colligative PropertieshardMCQ SINGLE⭐ Must-Do

For an arbitrary weak electrolyte with the formula undergoing partial dissociation in solution with Solutions and Colligative Properties Chemistry Question

Question

For an arbitrary weak electrolyte with the formula $A_x B_y$ undergoing partial dissociation in solution with a degree of dissociation $\alpha$, which of the following exact mathematical relationships defines the van't Hoff factor ($i$)?

Answer: B

💡 Solution & Explanation

The general dissociation reaction yields a total number of ions $n = x + y$ per formula unit. Substituting this into the standard van't Hoff dissociation formula $i = 1 + \alpha(n - 1)$ gives exactly $i = 1 + \alpha(x + y - 1)$.

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