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Q 1270067816.     30 ml `Na_2CO_3` solution is mixed in 20 ml `0.8 NH_2SO_4`. The resulting solution required `20` mL `0.7` `N` HCl for neutralization.
Calculate the strength of `Na_2CO_3` solution in g/L, Take `Na_2CO_3` as anhydrous.
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