In the Dumas method for estimating nitrogen, the evolved nitrogen gas is collected in a nitrometer o — Qualitative and Quantitative Analysis Chemistry Question
Question
In the Dumas method for estimating nitrogen, the evolved nitrogen gas is collected in a nitrometer over an aqueous solution of Potassium Hydroxide ($KOH$). The purpose of the $KOH$ is to:
Answer: C
💡 Solution & Explanation
The combustion products contain $CO_2, H_2O,$ and $N_2$. The concentrated $KOH$ completely absorbs the $CO_2$ and water vapor, leaving only the pure free nitrogen gas to be collected and measured at the top.
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