Calculate the Concentration of Ni2+ in a soltion which prepared as mixing 50.0ml 0.0300 M Ni2+ and 50.0mlml 0.0500 M EDTA at pH= 3

Question

Calculate the Concentration of Ni2+ in a soltion which prepared as mixing  50.0ml 0.0300 M Ni2+ and  50.0mlml 0.0500 M EDTA at pH= 3
At pH=3 , α4= 2.5x10-11   KNiY=4.2x1018