Sodium silicate

phenolphthalein reacting with sodium hydroxide consists of C20H14O4+ NaOH → NaKC8H4O4 (aq)+ H2O(l) Phenolphthalein is used as an indicator in this reaction because it changes color when a solution reaches a pH of around eight, or in other words the endpoint of a solution. It also allows us to see a physical change, thus resulting in a more accurate measure of how much was titrated. Citric acid is a weak acid, making it best titrated by using a strong base, such as sodium hydroxide. The…

specifically hydrochloric acid. The acid reacted with basic elements of the mixture and allowed for the simple extraction of the unknown basic compound. The same idea was then again applied when extracting the acid, a bas was used more specifically sodium hydroxide. The acid reacted with this base and separated off allowing us to drain in…

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…

Table 2. Recorded data of Physical and chemical properties of Wakefield Pond. Figure 3. Graph of temprature vs Depth in each lake. Figure 4. Graph of oxygen concentration vs Depth in each lake. Figure 5. Graph of light vs Depth in each lake. Figure 7. Sketches of plankton and relative aboundace from all two lakes Figure 8. Sketches of plamkton and relative aboundance from all two lakes. Figure 6. Fish in Wakefield Pond variety and numbers. Discussion Lake…

(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…

produces soap usually from the base hydrolysis of a fat or oil is called saponification. It is also known as soap making. Formerly, it is the reaction between an ester and sodium hydroxide to yield sodium stearate. The beef was used as triglyceride by boiling it with lye or an impure sodium hydroxide. The top layer is the sodium stearate wherein once it was cooled and turned into solid it was chopped into cubes of yellow soap. In addition, lye was traditionally made by the process of pouring…

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…