All the chemical experiments without proper protective measures are very dangerous and should be avoided as far as possible. The waste gas, waste water and waste residue produced in the reaction shall be well treated and shall not be discharged at will. Warning: the experiment described below involves sodium hydroxide, a highly corrosive drug. Please take protective measures. Do not use the reactants or products for illegal crimes. Any consequences caused by failure to follow the warning shall be borne by the person who fails to follow.

1.材料準備一袋純堿（碳酸鈉）

1. Material preparation: a bag of soda ash (sodium carbonate)

【4～5RMB  一包250g左右】小包波力/喜之郎海苔

[4-5rmb, about 250G / pack] xiaobaoboli / Xizhilang seaweed

【1.2RMB/包 兩包】小瓶礦泉水（怡寶或農夫山泉）

[1.2 RMB / two bags] small bottle of mineral water (Yibao or nongfushan spring)

【1.2RMB/瓶 需要兩瓶】兩到三張餐巾紙兩到三張作業本上的紙2.反應原理：CaO + H2O ==== Ca(OH)2

[1.2 RMB / bottle needs two bottles] two to three napkins, two to three sheets of paper on the operating book 2. Reaction principle: Cao + H2O = = = Ca (OH) 2

Ca(OH)2 + Na2CO3 ====2NaOH + CaCO3（沉淀）

Ca (OH) 2 + Na2CO3 = = = 2naoh + CaCO3 (precipitate)

1.將海苔吃掉，干燥劑取出備用。將一瓶礦泉水（下文中為A）喝掉三分之一。

1. Eat the seaweed and take out the desiccant for standby. Drink one third of a bottle of mineral water (a below).

2.將干燥劑倒入A中，靜待反應結束（小心燙傷）?！镜却龝r將另一瓶礦泉水B喝光】

2. Pour the desiccant into a and wait until the reaction is over (be careful of scalding). [drink up another bottle of mineral water b while waiting]

3.向A中加入純堿，直無沉淀生成。

3. Add soda ash into a until there is no precipitation.

4.靜置，使沉淀沉降。

4. Allow it to settle.

5.將餐巾紙和作業紙像濾紙一樣疊好，放在B瓶口。

5. Fold the napkin and working paper like filter paper and put them at the mouth of bottle B.

6.過濾注：

6. Filter note:

1.此方法制得的氫氧化鈉溶液較稀，可短時間小劑量直接接觸。

1. The sodium hydroxide solution prepared by this method is relatively thin and can be directly contacted in a short time and small dose.

2.溶液會在兩到四天內將塑料瓶蝕穿，請注意更換容器，以免造成損失。

2. The solution will corrode the plastic bottle within two to four days. Please replace the container to avoid loss.