1 Esercitazionemauro.pasquali/page2/page20/files/Testo 2... · 1. 0 . Esercitazione . 1) Bilanciare...
Transcript of 1 Esercitazionemauro.pasquali/page2/page20/files/Testo 2... · 1. 0 . Esercitazione . 1) Bilanciare...
10 Esercitazione
1) Bilanciare con il metodo ionico elettronico la seguente reazione mettendo in evidenza 10 scambio
elettronico
Se 25 grammi di K2Cr20 7 reagiscono con 4 grammi di KI in eccesso di acido nitrico quanti
grammi di iodio si formano
MAR H = 10 I N = 1401 0= 1600 K = 391 Cr = 5200 1=12690
2) Calcolare il ~Hreazstandard a 25 degC della reazione
sapendo che per Ie reazioni
il ~H~Pl7 = -106 Kcal
CH3CH0(l) + 112 02(g) iiii==j~ CH3COOH(l) iI ~HP~7 = -64 J 7 Kcal
Sono noti inoltre H(H20) =-6830 Realmol
H(CHaCHO) = -3976 Realmol AJlL
( t)
3) Ad una certa temperatura 065 moli di NH3(g) e 045 moli di HCI(g) sono introdotti in un recipiente
rigido del volume di un litro Dopo che si estabilito Iequilibrio
NH4CI(s) ~ NH 3(g) + HCI(g)
La fase solida eseparate da quella gas sosa e ciascLina di esse edisciolta in Lin litro dacglla a 25degC
Sapendo che il pH della soluzione nella quale estato disciolto il solido e pari a 498 calcolare il pH
dell altra Solllzione (a 25degC pKb=474)
4) 5i preparano due Solllzioni una di idrossido di magnesio Mg(OH)z (1) a concentrazione
110-4 M e Ialtra di acido acetico CH 3COOH (2) (Ka = 1810-5 ) in concentrazione 410-4 M 5i
calcoli il pH a 25degC delle due soluzioni 5i calcoli inoltre il pH della soluzione (3) otten uta
mescolando alia stessa temperatura volumi uguali delle due soluzioni
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