Sodium hydroxide

Task 3: Explain standard solutions and at least 3 different types of titrations that are used in industry and compare these to titrations in the lab. Standard Solutions & Titrations A standard solution is a solution of a known concentration. Standard solutions are made by dissolving an accurately weighed mass of a solid in a known volume of a soluble solvent using a volumetric flask. Method • Firstly, you would need to calculate the mass of the NaOH that you are going use. • Next you…

ENVM COMPREHENSIVE EXAM RISK MANAGEMENT 10/19/17 NAME: Sheetal M Patel STUDENT NUMBER: 540249 ENVM 665 Risk Management: Question 1 What are the two major general types of chemical sources that result in human exposure to those chemicals and provide a simplified “total” human exposure model showing the pathways that determine the total human dose from those chemicals. The total Human exposure model Source: http://exposurescience.org/a-total-human-exposure-model-them Chemical sources Lead…

(a) (b) (a) (b) 3. 1 Potentiodynamic polarization test of Mg-Zn-RE and Mg-Zn-RE-xCa alloys Potentiodynamic polarization test in Kokubo solution was carried out to evaluate the bio-degradation behavior of Mg-Zn-RE and Mg-Zn-RE-xCa alloys. The results (Fig. 1) revealed that the corrosion potential, Ecorr of Mg-Zn-RE alloy was -1841 mV, which…

Sultra the Vixen is a combination curling iron, hot air brush and dryer all in one sleek and beautiful volumizing package. While some other hot air brushes need to be used on slightly damp hair, or require product on dry hair, the Vixen uses hot air to heat the ceramic barrel. This creates a combination of hot air brush and curling iron that can be used on dry or damp hair. Instead of spending over an hour sectioning, blow drying, and curling your hair, you can achieve a beautiful blowout look…

3.3.9. Encapsulation efficiency of drug loaded NPs The encapsulation efficiency (EE) was determined by weighing the amount of unloaded drug recovered from lyophilization of the supernatant obtained after centrifugation of NPs. The drug encapsulation efficiency was calculated according to the following equation: Encapsulation efficiency (%) = (Winitial/Wfree)/Winitial *100%. Where, Winitial and Wfree are the weight of initial drug and the weight of free drug determined in the supernatant after…

DM and GalA content were determined according to the method reported by Aina et al., [32] and Food Chemical Codex 1996 [33]. 0.1g of pectin was weighed into a 250 mL conical flask, then wetted with 5mL ethanol. 100mLof deionized water was added, then six drops of phenolphthalein (0.1% in ethanol) indicator to each sample. Pectin dispersions were stirred until it was fully dissolved, thereafter, the solution was titrated slowly with 0.1N NaOH until the colour of the indicator just changed to…

Styrene (St, 99%) and methyl methacrylate (MMA, 99%) were obtained from Aldrich company. These monomers were first dried over calcium hydride, were purified by being passed through a column of basic alumina, and were distilled under reduced pressure. Ethyl 2-bromoisobutyrate (EBIB, 98%), copper (I) bromide (CuBr, 99%), copper (I) chloride (CuCl, 99%), and other chemical reagents were procured from Aldrich company and used as received. N-methylbis[2-(dodecylthio)ethyl]amine (SNS) was synthesized…

The substances found on the victims of the crash can be easily identified through simple math. You start by taking the percent values of each element found in the substance and changing it to grams, where one percent equals one gram, so that each element is out of one hundred grams. After finding the grams, you find out the moles of each element by multiplying the gram amounts by the conversion factor, which is 1 mol over the molar mass of the element you are dealing with, 12.01 grams for carbon…

3.2 N2O decomposition over Cs-doped Cu50Ce50Ox catalysts Fig.8. Conversion of N2O over different Cs-doped Cu50Ce50Ox catalysts Conditions: 2600 ppm N2O, balance He, 0.3 Mpa, GHSV-19,000 h-1. Fig.9. The T50 and T100 of different Cs-doped Cu50Ce50Ox catalysts The activities of the catalysts with different Cs content for N2O decomposition are shown in Fig.8, and the T50 and T100 (the temperature at which 50% and 100% conversion of N2O decomposition is achieved) are shown in Fig.9. It’s found…

The purpose of this lab is to calculate a value for Avogadro’s number and compare it to the actual value for Avogadro’s number. Avogadro’s number will be determined by setting up an electrochemical cell to oxidize a copper electrode. The results of the amount of copper deposited and the average current used will be used to calculate a value for Avogadro’s number. Techniques used: In this experiment, different techniques will be used to collect the required data, such as taking the mass of…