Phenolphthalein was used as indicator in both cases. CHN analysis: An Elementar Unicode instrument equipped with a combustion tube filled with tungsten(VI) oxide granules was used at a combustion temperature of 1050 °C. X-ray structure determination: In a glovebox, the dried powder sample was ...
Perpendicular cardo structural units were inserted into a polyurethane (PU) framework from the pH indicator (phenolphthalein (PP), phenol red (PR), or bromocresol green (BG)) sharing a triphenylmethyl group. The thermal transitions, mechanical properties, pH-sensitive color change, and low ...
using phenolphthalein as indicator and obtaining an exchange efficiency above 90%. The final solution contains 0.3 equivalencies of hydroxide per 1000 g of solution. Example 3 Preparation of an LTA Zeolite in the Absence of TIII Cations First, 3.9 g of tetraethylorthosilicate (TEOS) are added to...
Following this, 2 drops of phenolphthalein indicator (10 g/L) were added, and the solution was titrated with 0.1 mol/L of a NaOH solution to quantify the amount of fatty acid released. The assessment of lipase activity inhibition involved comparing the rate of fatty acid reduction to that ...
Studies in Honor of Prof. Francesco Maria Raimondo on the Occasion of His 80th BirthdayAdvanced Halophyte ResearchAdvancement in Gene Expression Regulation in Plants: Coordinating Growth, Development, and Stress ResilienceAdvancements in Cereal Quality Assessment: Implications for Crop Improvement and Food ...
Carbonate—Carbonates and bicarbonates effervesce with acids,evolving a colorless gas that,when passed into calcium hydroxide TS,produces a white precipitate immediately.Acold solution (1in 20)of a soluble carbonate is colored red by phenolphthalein TS,while a similar solution of a bicarbonate remains...
stand for 30minutes,then add phenolphthalein TS,and titrate the solution with 0.1Nsodium hydroxide VS.Perform a blank determination by titrating 50.0mLof the calcium acetate solution,and make any necessary correction.Each mLof 0.1Nsodium hydroxide is equivalent to 4.502mg of carboxyl groups (COOH)...
The high selectivity benefits from the role of phenolphthalein as a color indicator, an efficient phase transfer catalyst, and a preferred conformation of the starting materials as indicated by analyzing a single-crystal X-ray structure of an analogous macrocycle. The melt ROP of phenolphthalein ...
Insertion of a Cardo Structure into a Polyurethane Framework Using a pH Indicator and Its Impact on Tensile and Shape Memory PropertiesMacromolecular Research - Perpendicular cardo structural units were inserted into a polyurethane (PU) framework from the pH indicator (phenolphthalein (PP), phenol ...
SiO2 (aq) was measured using a visible spectrophotometer, and HCO3− and CO32− were measured through the titration of known volumes of HCl (0.05 mol/L) at the endpoints (defined as the solution colour changes) of phenolphthalein (10 g/L) and methyl orange (0.5 g/L) indicators. The...