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H2SO4(aq) mc011-1.jpg 2H+(aq) + SO42–(aq) The addition of which compound will cause a shift in equilibrium because of a common ion effect?

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hollymoppelt
what are the options because i think it is HCl and it has H+ as a common ion

JavierCollante
let say Na2SO4... this is an example of a compound that causes a shift. sodium sulfate is a soluble salt that dissolved in water to produces the ion Na+1 and SO4-. the sulfate ion is the common ion that will cause the original equation to shift to the left. 

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