Considere os pares de ácidos.
HF\ce{HF}HF e HClO\ce{HClO}HClO
HIOX3\ce{HIO3}HIOX3 e HClOX2\ce{HClO2}HClOX2
CX6HX5NHX3X+\ce{C6H5NH3^+}CX6HX5NHX3X+ e (CHX3)X3NHX+\ce{(CH3)3NH^+}(CHX3)X3NHX+
CX5HX5NHX+\ce{C5H5NH^+}CX5HX5NHX+ e NHX2NHX3X+\ce{NH2NH3^+}NHX2NHX3X+
Assinale a alternativa que relaciona os pares em que o primeiro ácido é mais forte.
HF\ce{HF}HF : Ka=4⋅10−4K_a=\pu{4e-4}Ka=4⋅10−4 HClO\ce{HClO}HClO : Ka=3⋅10−8K_a=\pu{3e-8}Ka=3⋅10−8 KaK_aKa (HF\ce{HF}HF) > KaK_aKa (HClO\ce{HClO}HClO)
HIOX3\ce{HIO3}HIOX3 : Ka=1,7⋅10−1K_a=\pu{1,7e-1}Ka=1,7⋅10−1 HClOX2\ce{HClO2}HClOX2 : Ka=1e−2K_a=1e-2Ka=1e−2 KaK_aKa (HIOX3\ce{HIO3}HIOX3) > KaK_aKa (HClOX2\ce{HClO2}HClOX2)
CX6HX5NHX3X+\ce{C6H5NH3^+}CX6HX5NHX3X+ : pKa=14−pKb ⟹ pKa=4,6 ⟹ Ka=2,5⋅10−5pK_a=14-pK_b\implies pK_a=4,6\implies K_a=\pu{2,5e-5}pKa=14−pKb⟹pKa=4,6⟹Ka=2,5⋅10−5 (CHX3)X3NHX+\ce{(CH3)3NH^+}(CHX3)X3NHX+ : pKa=14−pKb ⟹ pKa=9,8 ⟹ Ka=1,6⋅10−10pK_a=14-pK_b\implies pK_a=9,8\implies K_a=\pu{1,6e-10}pKa=14−pKb⟹pKa=9,8⟹Ka=1,6⋅10−10 KaK_aKa (CX6HX5NHX3X+\ce{C6H5NH3^+}CX6HX5NHX3X+) > KaK_aKa ((CHX3)X3NHX+\ce{(CH3)3NH^+}(CHX3)X3NHX+)
CX5HX5NHX+\ce{C5H5NH^+}CX5HX5NHX+ : pKa=14−pKb ⟹ pKa=5,2 ⟹ Ka=6,3⋅10−6pK_a=14-pK_b\implies pK_a=5,2\implies K_a=\pu{6,3e-6}pKa=14−pKb⟹pKa=5,2⟹Ka=6,3⋅10−6 NHX2NHX3X+\ce{NH2NH3^+}NHX2NHX3X+ : pKa=14−pKb ⟹ pKa=8,2 ⟹ Ka=6,3⋅10−9pK_a=14-pK_b\implies pK_a=8,2\implies K_a=\pu{6,3e-9}pKa=14−pKb⟹pKa=8,2⟹Ka=6,3⋅10−9 KaK_aKa (CX5HX5NHX+\ce{C5H5NH^+}CX5HX5NHX+) > KaK_aKa (NHX2NHX3X+\ce{NH2NH3^+}NHX2NHX3X+)