Which of the following has the highest buffer capacity? 0.50 M H2PO4−/0.50 M HPO42− 0.50 M H2PO4−/0.10 M HPO42− They all have the same buffer capacity. 0.10 M H2PO4−/0.10 M HPO42− 0.10 M H2PO4−/0.50 M HPO42−