Three samples were prepared for the analysis. The first sample was ammonium chloride, and 20.2 mg sample was used for the thermal analysis. The second sample was a mixture of ammonium chloride and magnesia, and 8.2 mg mixture (the molar ratio of NH4Cl:MgO was 3:1) was used for the thermal analysis. The third sample was a mixture of ammonium chloride, magnesia and potassium chloride, and 9.5 mg mixture (the molar ratio of NH4Cl:MgO:KCl was 3:1:1) was used for the thermal analysis. The samples were heated from room temperature to 750 oC with the nitrogen flow rate of 40 mL•min-1 and the heating rate of 10 oC•min-1.
It would have made sense if the weight had increased because that is what had happened the previous times we performed this experiment. The chemical equation was 4 Fe + 3 O2→ 2FeO2 which shows oxygen bonding to the iron. Experiment 4 In experiment four a dropper bottle that contained lead nitrate was placed in a beaker. The lead nitrate was clear and appeared to be liquid. Then, a dropper bottle containing sodium iodide was placed in a beaker.
Free acid was also presented as a peak at 1693 cm-1 associated with C=O stretch and 1157 cm-1 correspond to the C-O stretch. These peaks were absence in its sodium salt spectrum. The thermogram of DFA measured by DTA is also displayed in Fig. 2, which shows the endotherm curve of melting at 173.8 °C, similar with the base-drug property (Barbato et al., 2003). Therefore, based on both FT-IR and thermal analysis, confirmed that DFA was successfully prepared from DFS hydrolysis and ready to be used as a co-crystal raw material.
The reaction absorbance of prepared mixture absorbance was measured at 760 nm in a spectrophotometer (Jenway UK). The total concentration of phenolic compounds in the extract was determined expressed as microgram of pyrocatechol equivalent (PE) per milligram of driedy extract. The total phenolics compoundscontent was determined as the pyrocatechol equivalent using an equation obtained from a standard pyrocatechol graph (y = 0.0057 x total phenols [μg PE/mg of dry extracts] - 0.1646,
The result is expressed in mg of quercetin/g dry weight compared to the standard curve of quercetin, which is made in the same condition of the sample (Ghasemzadeh et al. 2010). 126.96.36.199. Antioxidant Activity Analysis From the extraction solution was taken 0.1 ml and react with 3.9 ml solution DPPH (2,2-diphenyl-1-picrylhydrazyl) 0.024 mg / mL for 30 minutes at room temperature and covered with aluminum foil. Measure sample absorbance in t = 0 and t = 30 with the spectrophotometer at wavelengths 515 nm.
3.1 Preliminary optimization studies 3.1.1. Effect of reaction time: Figure.3 represents the time progression for the enzymatic esterification of ethanol and hexanoic acid with 1:1 substrate ratio by Novozyme 435 (2 %) at 50 ˚C. It was observed that percentage conversion of ethyl hexanoate reached up to 73.6% in the initial 120 min. However, as the reaction proceeds further, a marginal change in conversion was observed after 120 min because of equilibrium of the reaction. This is attributed to the reversible nature of the esterification reaction.
Effect of variation of settling time The results of the tests conducted for studying the influence of settling time are shown in Fig. 8. For ferrous sulphate, within the first 15 min, 92.45% removal efficiency was observed which increased to 96.25 % after 30 min. As the graph show, the flocs formed by the coagulant, ferrous sulphate exhibits excellent settling characteristics. The floc quickly settles out within the first 15 min, with little change in final values after 30 min Fig.8 Effect of settling time on the Phosphorous Removal 3.2.
Montmorillonite K10 (Na+MMT) (Himadia), Ion exchange resin (CDH), sulfuric acid (1.84 g cm-3, 98 wt%; Merck), Dimethyl sulfoxide (DMSO) and methanol were used as recieved. SPEEK Synthesis SPEEK was prepared through the via of sulfonation reaction by using concentrated sulfuric acid at desired temperature. The dried PEEK pellets were ground well with the help of a martter for reducing dissolution time of the PEEK polymer. 5 g of crushed PEEK polymer were added slowly into 100 ml of concentrated sulfuric acid solution under stirring rate about 900 rpm till to reach a dark and viscous solution. Then the degree of sulfonation was controlled by changing the reaction time at constant temperature about 50 ºC[Erce Sengul, Hulya Erdener, R. Gultekin Akay, Hayrettin Yucel, Nurcan Bac, Inci Eroglu, international journal of
However, the first order rate constant was established; the errors did not significantly affect the accuracy of the analysis. Conclusion This experiment has successfully established that the reaction of the FD&C Blue#1 dye with sodium hypochlorite (NaOCl) is a first order reaction. The hypothesis was supported. The concentration, M, of the blue dye was 1.82×10-7 M and the rate, K, for the reaction was 0.1963 M-1min-1. The scenario was that the bleaching agent would decolorize a known volume of the dye within 15 minutes or less.
The selectivity for methanol was always above 95%. In their work they also studied the effect CO has on the hydrolysis of methyl formate for Cu/SiO2 catalyst. First the CO/H2 stream was introduced to the reduced catalyst and a spectrum recorded. A second spectrum