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黄钾铵铁矾[KNH 4 Fe x (SO 4 ) y (OH) z ]不溶于水和稀硫酸，制取黄钾铵铁矾的示意图如下： （1）溶液X是________。 （2）检验滤液中是否存在K ＋ 的操作是________________________。 （3）黄钾铵铁矾的化学式可通过下列实验测定： ①称取一定质量的样品加入稀硝酸充分溶解，将所得溶液转移至容量瓶并配制成100.00 mL溶液A。 ②量取25.00 mL溶液A，加入盐酸酸化的BaCl 2 溶液至沉淀完全，过滤、洗涤、干燥至恒重，得到白色固体9.32 g。 ③量取25.00 mL溶液A，加入足量NaOH溶液，加热，收集到标准状况下气体224 mL，同时有红褐色沉淀生成。 ④将步骤③所得沉淀过滤、洗涤、灼烧，最终得固体4.80 g。 通过计算确定黄钾铵铁矾的化学式(写出计算过程)。
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