This assignment is for wastewater treatment for environmental engineering class but it’s a chemistry problem about precipitation.
We need to calculate copper total concentration with and without the NH3 and plot the results on the same graph.
So the graph will be pH on x-axis and Copper CU++ total concentration on Y-axis, two curves represents 1st curve is Total concentraion of CU++=CU++ free + sum of OH- complex
2nd curve is the Total concentraion of CU++=CU++ free + sum of OH- complex + sum NH3 complex.