小忻和小燕合作测定盐酸、硫酸组成的混合酸中溶质的质量分数，设计并进行了如下两个探究实验：

【实验1】取20g该混合酸并分成4等份，然后分别加入一定量未知质量分数的BaCl₂溶液，实验记录如下：

【实验2】将【实验1】中的第4份反应液过滤，再向滤液中逐滴加入10%的NaOH溶液，通过pH测定仪打印出加入NaOH溶液的质量与烧杯中溶液pH的关系如图：

【数据处理】

小忻依据【实验1】沉淀的质量计算出混合酸中H₂SO₄的质量分数。

小燕依据【实验2】求混合酸中HCl的质量分数，过程如下：

解：设混合酸中HCl的质量分数为ω．

HCl+NaOH=NaCl+H2O

36.5        40

   10g×10%

解得：ω=0.1825=18.25%

现请你参与探究并完成相关问题。（可能用到的相对分子质量：H₂SO₄-98  BaSO₄-233   BaCl₂-208 ）

（1）【实验1】中发生反应的化学方程式为____ 

（2）小忻测出原混合酸中H₂SO₄的质量分数为____ （保留三位有效数字）；

（3）小燕计算出混合酸中HCl的质量分数会____ （填“偏高”、“偏低”或“无影响”），理由是____ （如“无影响”，本空不作答）．

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