Chemistry (7th Edition)

Published by Pearson
ISBN 10: 0321943171
ISBN 13: 978-0-32194-317-0

Chapter 4 - Reactions in Aqueous Solution - Worked Example - Page 118: 9


(a) $A_2Y$ is the strongest electrolyte because it is totally ionized, and $A_2X$ is the weakest, because it is the one with the lowest ionization. (b) A ions concentration: $0.700M$. Y ions concentration: $0.350M$. (c) $25$ $\%$.

Work Step by Step

(a) The separated spheres represent the ions, and the group of spheres represent the molecules. Therefore, the group with the higher concentration of separated spheres $(A_2Y)$ is the most ionized one, which makes it the stronger electrolyte. The one with the lower ions concentration is the $A_2X$, which makes it the weaker electrolyte. (b) Each $A_2Y$ has 2 $A$ ions and 1 $Y$ ion. Since it is completely ionized: $\frac{0.350 mol(A_2Y)}{1 L} \times \frac{2 mol(A^{n+})}{1 mol (A_2Y)} = 0.700M(A^{n+})$ $\frac{0.350 mol(A_2Y)}{1 L} \times \frac {1 mol(Y^{2n-})}{1 mol (A_2Y)} = 0.350M(Y^{2n-})$ (c) As we can observe, the solution has 4 $A_2X$, but only one of them is ionized: Percent ionization = $\frac{1}{4} \times 100 \% = 25\%$
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