To 1 L of 1.0 M impure H2SO4 sample, 1.0 M NaOH solution was added and a plot was obtained as follows:The % purity of H2SO4 and the slope of curve, respectively, are

i. Moles of NaOH = 1.0 M x 1.5 L = 1.5 molMoles of H2SO4 = 1.0M x 1 L = 1.0 mol2NaOH + H2SO4 → Na2SO4 = 2H2O2mol        1 molMoles of H2SO4 reacted with NaOH= 12mol of H2SO4=12×1.5=0.75 mol H2SO4% purity of H2SO4 = 0.75 mol  ×1001.0 mol=75%ii. For slope : xa+yb=1Slope yx=-ba=-1.51.5=-1