茶水間日記創挑第二期 - 【7/12+Day 95】再鋒利的刀也......（美麗化學5！）

正所謂，再鋒利的刀也有生鏽的一日（請注意：只能用于鐵做的刀），又正所謂人/芒果定勝天，在兼職芒果學完化學之後發現，是有方法，令刀沒有那麽快生鏽。

aka Factors lowering rate of rusting!

1. presence of alkaline

- immerse your knife into alkaline is a good way

- alkaline solutions (e.g. sodium hydroxide solution) suppress rusting

rate of rusting decrease

2. lower temperature

-erm maybe put your knife in the fridge

- reaction (*of losing electrons to form Fe2+ (aq) ions ) proceeds slower at lower temperatures

3. attaching / connecting a more reactive metal on iron

- consider putting some magnesium on the knife

- magnesium is higher than iron in the reactivity series

- magnesium loses electrons more readily than iron to give Mg 2+(aq) ions

- this prevents iron from losing electrons to form Fe 2+(aq) ions

- formation of Fe 2+(aq) ions is prohibited

- rate of rusting decrease

4. reduce area of knife that is bent or sharp

- uh maybe consider keep a round knife and make it sharp everytime before using

- at bent or sharp area, iron loses electrons more readily to form Fe 2+(aq) ion

formation of Fe 2+ (aq) ion is speeded up

rate of rusting increase

so keep ur knife less sharp

5. connecting your knife to the negative terminal of the battery

- iron loses electron less readily to the negative terminal of the battery to form Fe 2+ (aq) ion

- formation of Fe 2+ (aq) ion is slowed down 197Please respect copyright.ＰＥＮＡＮＡOMpPaeLLn8

- rate of rusting decrease

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