100 g of a mixture of $NaOH$ and $Na_{2}SO_{4}$ is neutralized by 100 ml of 0.5M $H_{2}SO_{4}$. What is the amount of $Na_{2}SO_{4}$ present in the mixture?}
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Only the base ($NaOH$) is neutralized by the acid; the salt ($Na_{2}SO_{4}$) remains inert in this reaction.