The Enthalpy of neutralization of acetic acid and sodium hydroxide is −55.4 kJ. What is the enthalpy of ionisation of acetic acid?


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Question Number 22879 by Tinkutara last updated on 23/Oct/17

$The Enthalpy of neutralization of$ $acetic acid and sodium hydroxide is$ $- 55.4 kJ . What is the enthalpy of$ $ionisation of acetic acid ?$
	Answered by Physics lover last updated on 23/Oct/17

	$\Rightarrow e n t h a l p y o f i o n i s a t i o n$ $= (- 55.4) - (- 57.3)$ $= 1.9 k j / e q$
	Commented by Tinkutara last updated on 23/Oct/17

	$Can you explain by writing chemical$ $reactions ?$
	Commented by Physics lover last updated on 23/Oct/17

	$a l r i g h t .$ ${C H}_{3} C O O H ⇌ {C H}_{3} {C O O}^{-} + H^{+}, Δ H = x . . . i$ ${N a}^{+} + {O H}^{-} + {C H}_{3} {C O O}^{-} + H^{+}$ $\to {N a}^{+} + {C H}_{3} {C O O}^{-} + H_{2} O, Δ H = - 57.3 K J . . . i i$ $i + i i$ ${C H}_{3} C O O H + {N a}^{+} + {O H}^{-} \to {C H}_{3} C O O N a$ $+ H_{2} O Δ H = - 55.4 K J (g i v e n)$ $u s i n g h e s s e s l a w$ $\Rightarrow - 55.4 = - 57.3 + x$ $\Rightarrow x = 1.9 K J$ $a l t e r n a t e t r i c k :$ $j u s t u n d e r s t a n d t h e c o n c e p t t h e$ $t h e a m o u n t o f h e a t w h i c h h a s n o t$ $b e e n l i b e r a t e d h a s b e e n u s e d t o$ $i o n i z e t h e a c i d .$
	Commented by Tinkutara last updated on 23/Oct/17

	$But only heat is 57.3 kJ when reaction$ $of strong acid and strong base . So why$ $why you have used 57.3 here ?$
	Commented by Physics lover last updated on 23/Oct/17

	$w e l l, a c t u a l l y t h a t i s t h e e n t h a l p y$ $o f r e a c t i o n o f a a c i d {I O N I S E D}$ $a n d a n I O N I S E D b a s e .$ $n o m a t t e r w h e t h e r i t s s t r o n g o r$ $w e a k, b o t h h a v t o b e i n i o n i c f o r m .$
	Commented by Tinkutara last updated on 23/Oct/17

	$Thank you very much Sir!$
	Commented by Physics lover last updated on 23/Oct/17

	$y o u a r e w e l c o m e . A n d y o u c a n$ $c a l l m e f r i e n d .$
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