Question

将硫酸钾,硫酸铝,硫酸钾铝三种盐混合溶于硫酸酸化的水中,测得c(SO42-)=0.105mol/L,c(Al3+)=0.

Answer 1

1molK2SO4 2molK+,1molSO4 2- (x)

1molAl2(SO4)3 2molAl3+,3molSO4 2- (y)

1molKAl(SO4)2 1molK+,1molAl3+,2molSO4 2- (z)

1molH2SO4 2molH+,1mol SO4 2-

c(H+)=0.010mol/L,c(H2SO4)=0.005mol/L

x+3y+2z=0.105-0.005=0.010,2x+6y+4z=0.020

2y+z=0.055,6y+3z=0.165

c(K+)=2x+z=0.035mol/L

答案选B.