# Why are NaCl plates used instead of quartz plates in IR spectroscopy to load sample?

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#### Explanation

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anor277 Share
Aug 9, 2015

Because glass (i.e. quartz) would absorb in the IR spectrum, and mask the absorption of your sample.

#### Explanation:

$N a C l$ absorptions are transparent to most of the $I R$ spectrum; there are absorbtions at $400 - 600 c {m}^{- 1}$, which leaves most of the spectrum transparent.

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