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How to distinguish sodium hydroxide and calcium hydroxide?
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Xiaoiao Li that calcium hydroxide solution is larger than sodium hydroxide solution in terms of the same mass of calcium hydroxide compared with the mass of sodium hydroxide to absorb carbon dioxide. Therefore, he thinks that saturated lime water should be used to absorb carbon dioxide. Please evaluate his conclusion on why calcium hydroxide solution absorbs more than sodium hydroxide solution A Xiao Li found that calcium hydroxide solution is larger than sodium hydroxide solution in terms of the same mass of calcium hydroxide compared with the mass of sodium hydroxide to absorb carbon dioxide. Therefore, he thinks that saturated lime water should be used to absorb carbon dioxide. Please evaluate his conclusion on why calcium hydroxide solution absorbs more than sodium hydroxide solution A Xiao Li found that calcium hydroxide solution is larger than sodium hydroxide solution in the same mass of calcium hydroxide compared with the mass of sodium hydroxide to absorb carbon dioxide. Therefore, he thinks that saturated lime water should be used to absorb carbon dioxide. Please evaluate his conclusion why calcium hydroxide solution absorbs more than sodium hydroxide solution A
1. Firstly, the molecular weight of calcium hydroxide and sodium hydroxide is different, and the reaction with carbon dioxide is also different (see below). The molar concentration of calcium hydroxide and sodium hydroxide with equal mass is different, for example, the mass concentration is 100g/L, the molar concentration of calcium hydroxide and sodium hydroxide is 2.7mol/L and 2.5mol/L respectively, and the molar concentration of calcium hydroxide is larger.
2. Turning to the reaction of calcium hydroxide, sodium hydroxide and carbon dioxide
The reaction between calcium hydroxide and carbon dioxide is:
1CaOH+2CO2=Ca (HCO3)2
2 CaOH+CO2=CaCO3
The reaction of sodium hydroxide and carbon dioxide is:
NaOH+CO2= NaHCO3
2 2NaOH+CO2=Na2CO3
Do you see that? The same concentration of calcium hydroxide absorbs twice as much carbon dioxide as sodium hydroxide.
Therefore, the absorption of carbon dioxide by the calcium hydroxide solution is greater than that by the sodium hydroxide solution
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