A0.500-l sample of h2so4 solution was analyzed by taking a 100.0-ml aliquot and adding 50.0 ml of 0.213 m naoh. after the reaction occurred, an excess of oh2 ions remained in the solution. the excess base required 13.21 ml of 0.103 m hcl for neutralization. calculate the molarity of the original sample of h2so4. (sulfuric acid has two acidic hydrogens.)

Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀ pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4. 0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.