Tannic Acid: Powdered Galls Extracted with Ether and Alcohol (75:25)

Pelouze's way of getting tannic acid from galls uses ether; Thorpe's Dictionary (1913) notes that a mixture of 75 % ether and 25 % alcohol can be used in its place. The extract separates into two layers, and the lower one, a strong tannic acid solution, dries to a porous mass. No amounts are given. Ether is very flammable: no flame, fume hood. The picture: our diagram.

중급

1 day

안내

Powder the galls

Grind oak galls finely. Ours: a mortar.

이 단계의 재료:

몰식자 (참나무 벌레혹)1 as required

필요한 도구:

돌 막자사발과 막자

Extract with 75 % ether, 25 % alcohol

Mix 75 parts commercial ether with 25 parts alcohol and extract the powder with it. Ours: shake in a stoppered bottle in a fume hood, away from any flame.

필요한 도구:

다이에틸에터

에탄올 - 실험실 등급, 95 %

눈금 실린더

마개 달린 유리병

흄 후드(배기 덕트형)

화학물질 비산 보안경

고무장갑

Keep the lower layer and evaporate it

The extract separates into two layers: gallic acid, wax and resins in the upper, a strong tannic acid solution in the lower. Evaporate the lower layer to a porous mass. Ours: separatory funnel, evaporating dish on a water bath.

필요한 도구: