Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 11 - Properties of Solutions - Exercises: 45

Answer

a) $NH_3$ b) $CH_3CN$ c) $CH_3COOH$

Work Step by Step

a) $NH_3$ is more soluble than $PH_3$ in water because the electronegativity difference between nitrogen and hydrogen is greater than that between phosphorous and hydrogen; therefore, $NH_3$ is more polar than $PH_3$ due to its more polar bonds and is more soluble. b) $CH_3CN$ is more soluble than $CH_3CH_3$ in water because $CH_3CN$ is polar while $CH_3CH_3$ is nonpolar, and water dissolves polar molecules better than nonpolar molecules. c) $CH_3COOH$ is more soluble than $CH_3COOCH_3$ in water because its oxygen atoms (the most electronegative atom in the molecule) are further from the center of the molecule than the oxygen atoms in $CH_3COOCH_3$, making $CH_3COOH$ more polar.
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