Question

What would be the color of the solution if thiocyanic acid (HSCN) is added?

Answer 1

$Fe^{3+}_{(aq)}+HSCN_{(aq)}\rightleftharpoons\>Fe(SCN)^{2+}_{(aq)}+H^+_{(aq)}$

When Thiocyanic acid is added to iron (iii) solution a blood-red color solution is formed due to presence of soluble Iron (ii) complex.