Why is pure sulfuric acid unsuitable for direct standard solution preparation?

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Pure sulfuric acid is unsuitable for direct standard solution preparation because it is hygroscopic, meaning it readily absorbs moisture from the air. This absorption can alter the concentration of the acid, leading to inaccurate titration results. The presence of water can dilute the acid, affecting the stoichiometry of the reaction during titration. Additionally, the variability in concentration makes it difficult to achieve precise measurements. Therefore, using pure sulfuric acid directly compromises the reliability of the standard solution.
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titration-->pure sulphuric acid

Homework Statement


Why pure/conc. sulphuric acid is not suitable to prepare a standard solution directly?


Homework Equations





The Attempt at a Solution


I know that it is hygroscopic,but what does it mean?Why absorbing moisture from the air will affect the result of titration?
 
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