
Equilibrio ácido - base
Authored by Heilen Arce
Chemistry
University
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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
La base conjugada del HPO42- es:
H3PO4
H2PO4-
PO43-
H3O+
OH-
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Al preparar una disolución de HClO 0,005 mol/L, el pH resultante será de:
(Ka HClO = 3,0 x 10–8)
2,30
4,91
7,00
9,09
11,70
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
El ácido láctico HC3H5O3 es un ácido monoprótico débil; una disolución 0,10 mol/L de este ácido tiene un pH de 2,44. La ka para el ácido láctico tiene un valor de:
3,6 x 10-3
1,4 x 10-4
1,3 x 10-5
3,8 x 10-2
9,6 x 10-2
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Cuál es la Kb del ion fluoruro (F-)?
(Para el HF = 6,61x10-4)
1,00x10-14
6,61x10-4
6,61x10-18
1,51x10-11
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
El porcentaje de disociación del HF en una disolución cuya concentración es 0,150 mol/L corresponde a:
(Ka HF = 6,61x10-4)
6,42%
0,44%
0,0099%
0,96%
6,64%
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A 25ºC una disolución 1,0 x 10–6 mol/L de piridina presenta un 3,74% de disociación. A esta temperatura, la constante de basicidad de la piridina, Kb, tiene un valor de:
1,0 x 10–6
7,1 x 10–6
1,4 x 10–9
1,0 x 10–8
1,0 x 10–14
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
El pH de una disolución 0,35 mol/L de NH4Cl a 25ºC, es:
(Considere que Kb NH3 = 1,8 x 10–5)
13,5
2,60
9,14
4,86
11,4
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