A stock solution of the correct concentrations of contaminant must be previously prepared.
2.
Other values may be used to determine a precise concentration of a stock solution.
3.
The stock solution is then diluted with a 9 : 1 ratio of absolute ethyl alcohol.
4.
Webster's reagent stock solution is made by saturating absolute ethyl alcohol with pellets of sodium hydroxide.
5.
His original recipe was one ounce of thymol crystals dissolved in five fluid ounces of surgical spirit to make the stock solution.
6.
Stock solutions do not necessarily come in concentrations of simple numbers; for example a solution could be 0.10082 M HCl.
7.
However, concentrated stock solutions may precipitate when cooled and should be kept at room temperature until precipitate has completely dissolved before use.
8.
FDA stock solution is prepared by dissolving 5 mg of fluorescein diacetate in 1 ml acetone, and sucrose may be added for live cell viability testing.
9.
In hospitals and laboratories, it is a biocide; it is especially important in bulk reagents and stock solutions which may otherwise support lactobacilli ) are intrinsically resistant.
10.
Our stock solution is 3 mL @ 10 mg / mL and is worth $ 6 and can be used to induce intoxicated states for hundreds of experiments at 15 flies each.
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