下列各组水溶液，当将其等体积相混合时，哪些组可以用作缓冲溶液，为什么？(1) [tex=10.357x1.571]wqeOYjgMPDqEo8SIBRtesG4vdA4srJ63vHPxkAW1qek/sCBT15uSeBrQxMms4rP9q0TSe5trvcoZRTmvJAaGgK7SB/aaVhNiXOYlcG6Ow1U=[/tex] 和 [tex=9.357x1.571]CO93LafWk97JvY57jISureYbGtuKnUJkBIVtdfwSkVWzM1YANQjU3QboVEzusLNfPDh4jgwtHpc60EW5llPlVT+KEqpfKjFgcsGCdUp9QOM=[/tex](2) [tex=9.357x1.571]CO93LafWk97JvY57jISurY/tnu2nEqP8de6QceuQiWKannHaJakHvSRS4epwSB1DY/neZh5vEHVz8AL2ileL+U0BUXu34yP/fOhPhyl39Qg=[/tex] 和 [tex=10.071x1.571]cjQSCueTyIX/55v7lhH/0PWU3eY2TBusdAMBQuIvF9ooDUjYz2mmlK0oalBiBZh72yCr+ssD18oBkfRUNfxLQNYly57t7ujyyrPJkCfQzzM=[/tex](3) [tex=9.357x1.571]CO93LafWk97JvY57jISurY/tnu2nEqP8de6QceuQiWKannHaJakHvSRS4epwSB1DY/neZh5vEHVz8AL2ileL+U0BUXu34yP/fOhPhyl39Qg=[/tex] 和 [tex=10.714x1.571]8OF+3WH0xOYiNX6+eg8xT5R813xZb9FOA3T16v1X/RiuxyvF/837CZWGbBk4U/9EFHu0eWehQuL/slqm3AdvyyXV5g7yurHaLzQLHauqHG0=[/tex](4) [tex=10.214x1.571]HB/KMIjbSRvc6INx7qBFuSDmwKOG0YZioalPeCI8i4WSThznJIoVX9PsXtHTyNzjMvZFyYVnuGuok3h6UNLoi1TLx5Q52V0THOaYBlKT6IA=[/tex]和 [tex=10.857x1.571]wqeOYjgMPDqEo8SIBRtesD/6St1IFLJlo84HmpD2AblN9sWevK453qEwzjkZNia2mSENlq/c0Z0jgOZ9hG/lSAtfKfrAxEdRnGYRX1gH4Cs=[/tex]