A kind of acid-base indicator and preparation method thereof
A technology of acid-base indicator and solvent, which is applied in the field of shikonin and curcumin compound acid-base indicator and its preparation, which can solve the problem of insufficient indication of acidic and strong alkaline solutions, which can only indicate acidity or alkalinity, but cannot indicate Alkaline solution and other problems, to achieve the effect of easy promotion, wide indication range and sensitive indication
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Embodiment 1
[0016] Take 1 g of shikonin with a content (ie, purity, the same below) of 80% and 0.71 g of curcumin with a content of 90%, add 80 milliliters of ethanol to dissolve, and filter. Add two drops of the filtered solution into 100 ml of acidic aqueous solution with pH less than 1, add dilute sodium hydroxide solution drop by drop, and observe the color and pH changes. The specific pH of the test solution was measured with a pH meter.
Embodiment 2
[0018] Take 1 g of shikonin with a content (ie, purity, the same below) of 80% and 0.53 g of curcumin with a content of 90%, add 80 milliliters of ethanol to dissolve, and filter. Add two drops of the filtered solution into 100 ml of acidic aqueous solution with pH less than 1, add dilute sodium hydroxide solution drop by drop, and observe the color and pH changes. The specific pH of the test solution was measured with a pH meter.
Embodiment 3
[0020] Take 1 g of shikonin with a content (ie, purity, the same below) of 80% and 1.07 g of curcumin with a content of 90%, add 80 ml of ethanol to dissolve, and filter. Add two drops of the filtered solution into 100 ml of acidic aqueous solution with pH less than 1, add dilute sodium hydroxide solution drop by drop, and observe the color and pH changes. The specific pH of the test solution was measured with a pH meter.
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