Question

往含有0.2 mol NaOH和0.1 mol Ba(OH)₂溶液中持續(xù)穩(wěn)定地通入CO₂氣體，當(dāng)通入氣體為8.96 L(標(biāo)準(zhǔn)狀況下)時(shí)立即停止。則這一過程中，溶液中離子的物質(zhì)的量和通入CO₂氣體的體積關(guān)系正確的圖象是（氣體的溶解和離子的水解忽略不計(jì)）（   ）

Answer 1

C

本題涉及的化學(xué)反應(yīng)為：Ba(OH)₂+CO₂====BaCO₃↓+H₂O                      ①
2NaOH+CO₂====Na₂CO₃+H₂O                                             ②
BaCO₃+CO₂+H₂O====Ba(HCO₃)₂                                                                ③
Na₂CO₃+CO₂+H₂O====2NaHCO₃                                           ④
當(dāng)未通入CO₂氣體時(shí)，溶液中離子分別為0.2 mol Na⁺、0.1 mol Ba²⁺、0.4 mol OH^-；當(dāng)通入2.24 L CO₂氣體時(shí)，發(fā)生反應(yīng)①，此時(shí)溶液中離子分別為0.2 mol Na⁺ 0.2 mol OH^-；當(dāng)通入4.48 L CO₂時(shí)，發(fā)生反應(yīng)②，此時(shí)溶液中離子分別為0.2 mol Na⁺、0.1 mol ；當(dāng)通入6.72 L CO₂時(shí)，發(fā)生反應(yīng)④，此時(shí)溶液中離子分別為0.2 mol Na⁺、0.2 mol；當(dāng)通入8.96 L CO₂時(shí)，發(fā)生反應(yīng)③，此時(shí)溶液中離子分別為0.2 mol Na⁺、0.1 mol Ba²⁺、0.4 mol ，共0.7 mol。對(duì)比圖象可知C項(xiàng)正確。