2.การเตรียมสารละลายมาตรฐาน-เตรียมst

2. preparation of standard solution-Prepare a stock solution of 3 h 2 na 0.0001 M. 250 ml volume is adjusted by methanol 50%-Prepare a stock solution of yot LU 0.003 M aluminum from aluminum complex compound in Tehran, watering. No HES dead with Hyper-react 3 h 2, na. Use the di water and methanol 50% paid solvent.-A standardized Aluminium Any aluminum Diecasting niat from stock solution into a bottle of 5ml Temple in volume 10 ml. Adjust the ph to 4.5 2.1 h 3 M na 0.0001 ml adjust volume with methanol 50 till 10 minutes shaking the tick.Equipment to measure the intensity of light by a full on ro meter.

2. Preparation of standard solution
- prepare a stock solution of 3h2na 0.0001M adjusted to a volume of 250 ml. By 50% methanol
- prepare a stock solution of aluminum at 0.003M. The aluminum complexes in the world's high-Dade nitrates react with di 3h2na water and 50% methanol as a solvent
- the standardized. Aluminium
pipette alumina, from Catalonia stock solution 5ml in 10 mL volumetric flask ph adjustment was 4.5 mL volumetric filling 0.0001M 3h2na1 with methanol reached 50, meaning 10 minutes, shaking
the machine to measure the concentration it. sent by fluoro meter.

2. Standard solution preparation
- prepare stock solution of 3h2na 0.0001M to adjust the volume 250 ml methanol 50%
- prepare the stock solution. Would 0 of tradition.003M from aluminum complexes in developing non? Hi Dade 3h2na reacted with water and methanol solvent di 50%เปน
- standardized. Aluminium
pipette aluminium from stock solution 5ml into a measuring volume 10 ml adjust pH was 4.5 fill 0.0001M 3h2na1 ml adjust volume with methanol 50 until struck literally shake 10 minutes
bring the plane to เเสงโดย machine auto โรต์ fluoride concentration meter.