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Silica Gel Packets: Water Glass Set with Acid, Washed, Dried and Bagged
Silica gel soaks up moisture: packed in small permeable bags it keeps sealed boxes dry. Acidify water glass and a jelly-like silica falls; wash it, dry it out at about 120 °C, and sew it into muslin sachets. A spent packet comes back to life after an hour or two at 120 °C.
The picture: silica gel beads.
中级
Three days
说明
1
1
Set the gel
Set the gel
Dilute the water glass with about its own volume of water (ours). Stir in dilute sulphuric acid slowly until the liquid sets to a gel and a drop turns blue litmus red.
此步骤所需材料：
Water Glass (Sodium Silicate Solution)1 升所需工具：
水
稀硫酸
大汤锅
玻璃搅拌棒
石蕊试纸
化学防溅护目镜
橡胶手套2
2
Wash
Wash
Break up the gel and wash it several times with clean water on a cloth, squeezing it out each time.
所需工具：
布（过滤用）水大汤锅化学防溅护目镜橡胶手套3
3
Dry out
Dry out
Spread the gel thin in dishes on the sand bath and dry it at about 120 °C, checked with the thermometer, until it is hard, glassy grains. Weigh it and keep it in a closed jar until bagged.
所需工具：
蒸发皿
砂浴
温度计
等臂天平
玻璃罐4
4
Sew the packets
Sew the packets
Cut small squares of muslin, sew them into bags on three sides, fill each with a measure of gel and sew it shut.
此步骤所需材料：
平纹细布0.5 m2
亚麻线20 m所需工具：
剪刀
缝衣针等臂天平5
5
Packets
Packets
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