để trung hòa 250ml dung dich NaOH 3M và Ca(OH)2 2M cần vừa đủ V ml dung dịch HCl 1,5M và H2SO4 1M. Tính giá trị của V và khối lượng muối khan thu được khi cô cạn dung dịch sau phản ứng?

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