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喜食豆腐．今天，让妈妈为她做菠菜炒豆腐．可的妈妈却告诉她菠菜不能与豆腐同食． 【提出问题】菠菜为什么不能与豆腐同食? 【查阅资料】草酸钙(CaC 2 O 4 )是不能被人体吸收的沉积物．豆腐中含有较多的钙盐[如硫酸钙(CaSO 4 )等]，菠菜、洋葱、竹笋中含有丰富的草酸(H 2 C 2 O 4 )、草酸钠(Na 2 C 2 O 4 )，豆腐和上述几种蔬菜混合食用，可能诱发“结石”症． (1)由草酸的化学式可知其中碳元素的化合价为__________． (2)草酸与硫酸钙反应的化学方程式为H 2 C 2 O 4 +CaSO 4 ===CaC 2 O 4 ↓+H 2 SO 4 ，请写出草酸钠与硫酸钙反应的化学方程式：__________________． 【提出猜想】菠菜与豆腐同食可能会诱发“结石”症． 【设计实验】 实验步骤 实验现象 实验结论 ①将菠菜在少量开水中煮沸2 min～3 min，取1 mL～2 mL滤液于试管中，并滴加少量_________溶液 产生白色 沉淀 有草酸钙 生成 ②在步骤①的沉淀物 中加入过量醋酸 沉淀部分溶解， 且产生气泡 被溶解的沉淀一定 不是_____________ 【发现新问题】被溶解的沉淀是什么?产生的气体又是什么?于是她又设计如下实验进一步探究： 实验步骤 实验现象 实验结论 ③将步骤②产生 的气体通入__________中 ______________ 产生的气体是__________；步骤②被溶解的沉淀是碳酸钙
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