Ci ny ha phn tch nhng ha i cng k cho u. Nu c th vn thiu..

[SCN-]= 0,05 M; [Fe3+]=5.10-3 M; [ F-]= 0,5M . Fe3+ to phc trc vi F- (d a vo dy ha hc quang ph) v ??? V b qua cn bng nhiu to phc ng thi ca F- v SCN- (chc do thiu hay sao??? Khi anpha s khc?)

Ta c:

Nng Fe3+ cn li:

Fe3+ tip tc to phc vi SCN-: Fe3+ + SCN-Fe(SCN)2+

[ Fe(SCN)2+] = -Khng to mu mu.