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Chapter 14: Q14.1-14 E (page 765)

Is the self ionization of water endothermic or exothermic? The ionization constant for water \(\left( {{K_W}} \right)\)is 2.9* \({10^{ - 14}}\)at \({40^ \circ }{\rm{C}}\)and 9.3 x \({10^{ - 14}}\)at \({60^ \circ }{\rm{C}}\)

Short Answer

Expert verified

Self ionization of water is endothermic process.

Step by step solution

01

Define endothermic or exothermic

In endothermic process the system absorbs energy (heat) from the surroundings whereas in exothermic process the system releases energy to the surrounding.

02

Find self-ionization of water endothermic or exothermic

Self ionization of water is endothermic process because its ionization constant \(\left( {{K_W}} \right)\) is increasing at higher temperatures. Endothermic processes are ones that take up the heat from the surroundings so higher temperature pushes the equilibrium towards the products. Hence constant is greater.

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Most popular questions from this chapter

Question: Show by suitable net ionic equations that each of the following species can act as a Bronsted-Lowry acid: (a) \(HN{O_3}\) (b) \(PH_4^ + \) (c) \({H_2}S\) (d) \(C{H_3}C{H_2}COOH\) (e) \({H_2}PO_4^ - \) (f) \(H{S^ - }\)

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Determine \({K_b}\)for the nitrite ion, \(NO_2^ - \). In a \(0.10 - M\)solution this base is \(0.0015\% \)ionized.
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