It can be observed that up to 8 h reflux with HNO 3 the -COOH concentration increases to ca. 2-4 . 10 21 sites/g, but it remains approximately constant even if the carbon is further refluxed with HNO ...

In a titration, 25.0 cm 3 of 0.2 mol/dm 3 sodium hydroxide solution is exactly neutralised by 22.7 cm 3 of a dilute solution of hydrochloric acid. The equation for the reaction is: NaOH + HCl → ...

Hydrochloric acid (0.1 M): Prepared by successive dilution of concentrated acid (S.D. Fine Chem, Mumbai, ... Standard drug solutions of 25 µg mL-1 each in 0.1 M HCl and 0.1 N NaOH for method A, and ...

Briefly, 5 mL aliquots of the filtrate were transferred to 50 mL round-bottom flasks and acidified with 0.05 M HCl. The aim of this step is to add acid until a pH of 2 or 3 is achieved, ... ΔV NaOH is ...

Phenolphthalein indicator in acid-base titration. Phenolphthalein indicator in acid-base titration. scientific experiment with HCl acid in Conical flask, Burette with Sodium hydroxide NaOH, pipette ...

Thus, studied titration method can be successfully used in quantitative analysis of ascorbic acid from different samples. Key words: ascorbic acid, antioxidant action, quantitative analysis, ...

In metrology, the certification of potassium hydrogen phthalate (KHP) as a reference material is made using the potential primary method of coulometric titration. Usually, this titration is performed ...

The 2020 ACR guidelines for gout management recommends ULT dose titration, based on serial urate measurements, with a target of 6 mg/dL or lesser (<0.36 mmol/L). The researchers of the TICOG study ...