Preparation and application of No. 1 turbidity standard colorimetric solution

Beijing Huakesheng Fine Chemical Products Trading Co., Ltd. produces and sells Nr. 1Turbidity standard colorimetric solution:

Preparation: Take 15ml of sulfuric acid, slowly inject an appropriate amount of water, cool to room temperature, add water to dilute to 1000ml and shake well.

3D model

Calibration: Take the standard anhydrous sodium carbonate dried to constant weight at 270~300℃ for about 0.8g, accurately weighed, add 50ml water to dissolve, add 10 drops methyl red-bromocresol green mixed indicator solution, titrate with this solution until the solution changes from green to purple, boil for 2 minutes, cool to room temperature, continue titration until the solution changes from green to dark purple. 5 mol/L) corresponds to 26.50 mg of anhydrous sodium carbonate. Calculate the concentration of this solution based on the consumption of this solution and the amount of anhydrous sodium carbonate ingested.

2. Methyl Red Indicator Solution

Take 0.1 g of methyl red, add 7.4 ml of 0.05 mol/L sodium hydroxide solution to dissolve, then dilute with water to 200 ml.

3. Sodium hydroxide titration solution (0.5mol/L)

Prepareng: take an appropriate amount of sodium hydroxide, add water and shake to dissolve into a saturated solution, put into a polyethylene plastic bottle after cooling, let it stand for several days and clarify for backup use. Take 28 ml of clear, saturated sodium hydroxide solution, add freshly boiled cold water to 1000 ml and shake well.

Kalibration: take the benchmark dried at 105°C to constant weight

about 3g of potassium hydrogen phthalate, accurately weighed, add 50ml of freshly boiled cold water and shake to make it Dissolve as much as possible, add 2 drops of phenolphthalein indicator solution and titrate with this solution. When approaching the end point, potassium hydrogen phthalate should be dissolved and titrated until the solution turns pink. Each 1 ml of sodium hydroxide titration solution (1 mol/L) corresponds to 102.1 mg of potassium hydrogen phthalate. Calculate the concentration of this solution based on the consumption of this solution and the amount of potassium hydrogen phthalate ingested. No. 1Turbidity standard colorimetric solution

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