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2ª Evaluación Quimica COU
Cantos cc dunha disolución 0'4M de hidróxido sódico (NaOH) serán precisos para neutralizar 100cc dunha disolución 0'2M de ácido clorhídrico (HCl)? Si engadimos 3cc máis dos precisos, ¿cal será o PH resultante?
Dádolos ácidos sulfídrico (H2S), Ka=1'1. 10-7; nitroso (HNO2) Ka= 5'1. 10-4 e fluorhídrico (HF), Ka= 6'8. 10-4, cál deles é o máis forte e o máis feble? Razona a túa resposta.
O producto de solubilidade do hidróxido de Magnesio (Mg (OH)2) a certa temperatura, é Ks= 32. 10-12. ¿Cal é a solubilidade en auga pura?
Calcula a solubilidade do hidróxido de Magnesio nunha disolución 0'1M de hidróxido sódico. Toma Ks do problema anterior.
Unha pila esta formada polos pares Ag+/Ag e Fe2+/Fe de f.e.m. 0'80 voltios e -0'44 voltios respectivamente. Escribe as reaccións que teñen lugar en cada un dos electrodos, así como a reacción global. Que electrodo é o ánodo e cal o cátodo? ¿Cal é a f.e.m. da pila?
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Enviado por: Puesto 13 Idioma: gallegoPaís: España