This article compares completely contrasting marketing strategies of two most successful comparies: McDonalds and Apple. Survey was conducted and depicted by graphs, for different nationalities to ...
The calcium and iron is common problem in children's lack of nutrients is one of the factors. Coconut dry dates and Jaggery was used for the development of ready to eat Indian traditional sweet meal commonly known as ladoo with rich source of calcium
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for Education students majoring in englishFull description
for Education students majoring in english
Descripción: TiO2 nano
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Preparation,Approval and Control of SOP
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preparation and evaluation of instructional materialsFull description
Standardization is the process of determining the exact concentration (molarity) of a solution. Titration is one type of analytical procedure often used in standardization. In a titration, a…Full description
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PREPARATION and STANDARDIZATION of HCl and NaOH a-Preparation of ~0.10M HCl
1- Take a 1000 or 2000 ml of storage bottle. Wash it well with soap or detergent first. Rinse it out with tap and then with distilled water couple of times. 2 - Measure 1000 -ml of distilled water into a beaker. Heat the water to boiling. 3 - Then cool it to room temperature. Add about 8 ml of conc. HCl (12M), mix it well and store it in a stoppered bottle. b-Preparation of ~0.10 M NaOH 1- Take a 1000 or 2000 -ml of storage bottle. Repeat the washing procedure as given in part a.
2- Measure 1000 -ml of distilled water into a beaker. Heat the water to boiling, then cool. Add about 4 g of NaOH pellets weighed onan watch glass, mix it well and store it in a rubber stoppered bottle. (Caution : NaOH is very corrosive, do not spill and if you do, wash it off immediately with an excess of water.) Things to be done before the experiment Obtain the burette set. Wash it well with detergent water and then rinse it out couple of times with tap and distilled water. Rinse it out once m ore with the solution to be standardized and then fill it up with the same solution. Be sure that the tip of the burette is free of air bubbles. Standardization of HCI 1- Weigh duplicate ~0.20 to 0.25 g (± 0.1 mg) samples of previously dried standard Na 2C0 3. Dissolve samples in ~100- ml distilled water; if it does not dissolve quickly, you may warm the solution.
2 - Cool the solution to room temperature and add ~3 drops of bromocresol green indicator, solution turns into blue. Titrate it with HCluntil green color is reached. 3 - Heat and boil out C0 2 gently. You should obtain a blue color again at the end of this step. Cool to room temperature, and continue titration until yellow color is reached. 4 - Calculate the molarity of HCI, it should agree to about two parts per thousand. If they do not agree, repeat the procedure for the third time and take the avg. of the two closest results.
Standardization of ~0.10M NaOH 1- Weigh duplicate samples of 0.50-0.60 g of previously dried standard KHP into 250- ml flasks. Dissolve each sample in ~100- mlboiled distilled water.
2 - Cool to room temperature, add 2-4 drops of phenolphthalein indicator. Titrate it with NaOH until the first appearance of a permanent, pink color. 3 - Back titrate with your standard HCl if you miss the end point. Calcu late the molarity of NaOH solution. 4 - If runs do not agree to about two parts per thousand, repeat for the third time and take the avg. of the two closest results.