r.p.m Ce % extraction 100 13.53 95.89 200 12.58 96.18 300 4.79 98.54 400 2.95 99.10 500 11.21 96.60 As shown from table increasing the R.P.M from 100 to 400 increases % extraction then decreases; so time 400 R.P.M was chosen as optimum speed of agitation. 4.4. Effect of initial concentrations of iron (III) Table 4. Percentage extraction at different initial concentrations of iron (III). Ci(mg/L) Ce(mg/L) % extraction 95.24 2.45 97.42 125.9 3.04 97.58 329.7 2.95 99.10 1955 0.43 99.97 As shown from table 4 increasing the initial concentrations of iron (III) from 95.24 to 1955 ppm has increased % extraction.
The major bands from the IR are, FTIR: sp3 O-H stretch, about 3200-2500 cm-1 (b, m); sp3 C-H stretch, 2991-2868 cm-1 (sh, m); sp2 =C-H stretch, 3100-3000 cm-1 (sh, w); sp2 C=O stretch, 1701 cm-1 (sh, s); and sp2-sp2, aromatic, C=C stretch (in ring), 1507 cm-1 (s, m). Formation of Diastereomeric Salts: 30 mL of 0.25 M sodium hydroxide was added to the flask that contained the crude ibuprofen. This flask was heated to 85°C with the addition of 0.9 mL of S-(-)-α-phenethylamine (d=0.94 g/mL, 6.981 mmol). The crude salt was collected via vacuum filtration for 30 minutes and the percent yield of the salt formation was 98.688 %.
Three alloys were prepared having 2.5, 3.0 and 3.5 weight percent silver designated as hypo-eutectic, eutectic and hyper-eutectic alloys, respectively. To replenish indium losses during alloy making, a 1.5% allowance was added for charge calculations. The alloy making sequence was as follows: first pre-weighed indium shots were placed in an alumina crucible and heated to 165 °C. After complete melting of indium, pre-weighed silver filings were added in the melt and stirred with stainless steel spatula. The temperature of the melt was raised to 185 °C and the melt was kept on stirring for 10 minutes.
This solution was diluted with diluents to gae a concentration of 0.1 mg/ml solution each of Amoxicillin trihydrate. The HPLC method was applied to the solutions and the results obtained were shown in table 4.6.11. System suitability solution: 25.0 µg/mL each of of USP Amoxicillin RS in Diluent. Precision
1.0 ml 0.02 N NaOH = 1.0 mg CaCO3 (d) Phenolphthalein indicator: Dissolve 0.5 g of phenolphthalein in 100 ml alcohol and water. (e) Methyl orange Indicator: Dissolve 0.5 g of methyl orange in distilled water and dilute it to 100 ml in a volumetric flask. Procedure: Indicator Method: Pipette 20 ml or a suitable aliquot of sample into a 100 ml beaker. Divide the sample water into two parts and determine the pH of two parts. If pH is less than 3.7, add two drops of methyl orange indicator into the first sample beaker and titrate with standard 0.02 N sodium hydroxide solution until the color changes to the faint orange.
4.3: EXPERIMENTAL PROCEDURE A standard solution of H2O2 was prepared with a concentration of 0.1000 ± 0.0015 mol dm-3 by diluting a 0.88 mol dm-3 sample of H2O2 in an Erlenmeyer flask. Instantly, the Erlenmeyer flask was secured with a rubber stopper to limit the risk of H2O2 from decomposing quickly. Since the reaction of the decomposition of H2O2 with the catalase found in yeast is very fast, a low concentration of H2O2 was kept constant at 0.1000 ± 0.0015 mol dm-3 in order for the reaction to be observed more easily, hence also minimizing systematic errors. The water bath was completely filled with tap water and was set to 297.0 ± 0.1 K. Used a scoopula to take out Fleischmann’s active dry yeast from its container and measured exactly
R. grade) in distilled water and make up to 1000 ml. 1.0 ml = 100 µg SO4 2- Preparation of blank, standard and sample solutions • Take six 50 ml flasks (4 for standard, 1 for blank and 1 for sample). • The standards are prepared at 5mg/L increments in 0-40 mg/L sulphate range. Beyond 40mg/L accuracy decreases and barium sulphate loses stability. • To the fifth flask (sample flask) add sample • To the sixth flask (blank flask) add only distilled water.
The design reveals that only pH, pulp density and second order interaction pH×pulp density and pulp density×flocculant dose are influential statistically. The resultant mathematical model for grade and recovery of the concentrate are as follows, % Grade = 60.185 + 0.545A - 0.495B - 0.845AB + 0.585BC And, % Recovery = 89.2462 + 2.7987A + 3.3463C - 1.5838AB + 1.2437AC + 0.8288BC The R2 value for grade and recovery is 99.88% and 99.94% respectively. The high R2 value represents that the model obtained is able to give a good response for the system in the range studied. From the studies it was found to enhanced the grade of iron to 62.78% Fe with 84.23% recovery at a condition of pH 10, pulp density 1%, and 0.03 mg/g flocculant dose. ACKNOWLEDGEMENTS The authors would like to gracefully acknowledge to Steel Authority of India Ltd. for providing the iron ore slimes for this
From equation , the Absorbance, Abs = ebC. Thus, C = Abs/e*b e*b = 1 dm ×100cm/dm × 1.38 × 〖10〗^5 cm^(-1) M^(-1) L. =1.38 × 〖10〗^7 C=Abs/(1.38 × 〖10〗^7 ) C=(2.507)/(1.38 × 〖10〗^(-3) )=1.82×〖10〗^(-7) M The value of K: From the calculations above, the rate law equation  reduces to: Rate = K_observed 〖[Blue dye]〗^x Where Kobserved = K [NaoCl]1 and Kobserved is the experimentally obtained value of K = 0.1963 M-1 min-1. Thus, Rate =0.1963/(M.min) 〖[Blue dye]〗^x From Figure 3, it was established that the reaction was in first order. Thus, the overall rate law equation reduces to: Rate = 0.1963〖M^(-1) min^(-1)× [Blue dye]〗^1 Rate = 0.1963M^(-1) min^(-1)× 〖[1.82×〖10〗^(-7) M]〗^1 Discussion From Part B, the optimal reactants combination selected for Part C was 1.00 ml of Clorox + 40 ml of Blue dye because the mixture turned colorless in ~15 minutes (15:32.58 s). In addition, the graph of In[A] versus time was linear.
Firstly a 100 ml solution of AgNO3 (1mM) is prepared in a beaker. Then 10 ml of sodium borohydride (0.1M) is added drop wise to the beaker under continuous stirring for 6 hours. A change in the colour is observed and a solution of pale yellow is obtained. This mixture is allowed to rest for 8 hours before use. 2.3.2 Preparation of silver nanoparticles with citrate as capping agent Firstly a 10 ml solution of AgNO3 (0.01M) is prepared in a beaker.