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BaCl2(aq) + H2SO4(aq)BaSO4(s) +HCl(aq) 
Ba2+(aq) + SO4(aq)BaSO4(s) 
Ba2+(aq) + 2SO4(aq)Ba(SO4)2(s) 
Ba2+(aq) + SO42-(aq)BaSo4(s)
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