y bench dilute hydroxide is not a good primary standard?
回答 (1)
2007-09-08 6:38 pm
✔ 最佳答案
Because sodium hydroxide NaOH react with carbon dioxide CO2 in the air to form sodium bicarbonate NaHCO3 and sodium carbonate Na2CO3NaOH + CO2 －＞ NaHCO3
2NaOH + CO2 －＞ Na2CO3 + H2O
which decrease the alkaline value of the dilute hydroxide solution with time, so it is not a good primary standard.
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