Lactic acid sodium hydroxide

Sodium lactate: 1. Sodium hydroxide solution (1mol / L)
Preparation: Take clarified saturated solution of sodium hydroxide 56mL, add boiling over cold water to make into 1000mL.
Calibration: in 105 ℃ drying to constant weight basis of potassium hydrogen phthalate about 6g, accurately weighed, add boiling over cold water 50mL, shake, to try to dissolve; add 2 drops of phenolphthalein indicator solution, with the droplets, close to the end, should make potassium hydrogen phthalate is completely dissolved, the solution was titrated to pink. Each 1mL of sodium hydroxide (1mol / L) is equivalent to 204.2mg of potassium hydrogen phthalate. According to the liquid consumption of potassium hydrogen phthalate and dosage, calculate the concentration of the solution.
Storage: polyethylene plastic bottle,ferrous lactate; plug two holes, each hole insert the glass one, one with soda lime tube connected to a suction of the fluid for use.
2 acid titration solution (0.5mol / L)
Preparation: Sulfate 30mL, slowly inject the right amount of water, cooled to room temperature, diluted with water to 1000mL, shake.