What is mother liquor in high school chemistry?

Mother liquor: The medium commonly used in experiments can be dispensed into 10 times and 100 times the mother liquor.

Mother liquor is used to easily prepare nutrient bases.

The preparation of mother liquor has two advantages: one is to reduce the trouble of preparing and weighing drugs each time, and the other is to reduce the error caused by very small amounts of drugs in each weighing.

Types of Mother Liquor:

1) A large number of elements mixed mother liquor: refers to the concentration of elements greater than the element, that is, containing N, P, K, CA, MG, S and other six salts of the mixed solution, can be prepared into 10 times the mother liquor, with every 1000ml to take 100ml of mother liquor, pay attention to the following points: a

The compounds must be sufficiently dissolved before they can be mixed. b.Pay attention to the order of mixing, especially to stagger calcium ions with sulfate ions and phosphate ions, so as to avoid the precipitation of insoluble compounds such as calcium sulfate and calcium phosphate.

c.Mix slowly, stirring as you go.

2) Trace element mixed mother liquor: refers to the elements less than the mixed solution containing B, Mn, Cu, Zn, Mo, Cl and other salts other than Fe, due to the low content, it is generally prepared into 100 times or even 1000 times, and 10ml or 1ml is taken for every 1000ml. When mixing, it is also necessary to pay attention to dissolving sequentially and then mixing to avoid precipitation.

3) Iron salt mother liquor: Iron salt must be prepared separately, if mixed with other inorganic elements to form the mother liquor, it is easy to cause precipitation. The preparation method is to slowly add the aqueous solution to the slightly boiling aqueous solution, and stir constantly, and finally set the volume to 1000ml, and take 5ml for each 1000ml medium.

4) Organic compound mother liquor: mainly vitamins and amino acids, these substances can not be prepared into a mixed mother liquor, must be prepared into a separate mother liquor, the concentration of which contains mg compounds per ml, and is appropriately taken according to the required concentration.

5) Plant hormones: Each hormone must be prepared separately as a mother liquor, and the concentration is per ml containing0mg hormone, the hormone concentration is expressed in two ways, one is ppm (or the number of mg per liter), and the other is mol

Use as needed. Since most hormones are poorly soluble in water, they are formulated as follows:

1) IAA iba GA3 is first dissolved in a small amount of 95% alcohol, and then water is added to set the volume to a certain concentration.

2) NAA can be dissolved in hot water or a small amount of 95 alcohol, and then added to water to dissolve to a certain concentration.

3) Insoluble in water for 2,4 days, it can be dissolved with 1mol of NaOH, and then added water to a certain concentration.

4) Kin and Ba are first dissolved in a small amount of 1mol HCl, and then water is added to determine the volume.

5) Zeeatin is first dissolved in a small amount of 95 alcohol, and then water is added to a certain concentration.

Resources.

It looks like a liquid part after filtration.

I don't think it's filtered

Mother liquor - in order to avoid weighing dozens of chemicals every time the medium is prepared, the various components in the medium should be weighed 10 times, 100 times or 1000 times the original amount to prepare a concentrate, which is called mother liquor. In this way, each time the medium is prepared, 1000 of its total amount is taken and diluted to form a culture medium.

By-products - In chemical reactions, some chemical reactions are affected by conditions such as temperature, air pressure, reactant concentration, etc., and cannot produce the substances in the theory according to the theory, but form other substances. These substances are by-products.