SYSTEM SUITABILITY THEORETICAL PLATES: A standard solution of 25 µg mL-1of Amoxicillin trihydrate (in triplicate) was prepared and same was injected, then the system suitability parameters were calculated. Theoretical plates per meter Theoretical plates per meter were calculated from the data obtained from the peak using the following expression n = (5.54Vr2)/LWh2 Theoretical plates per column Theoretical plates column were calculated from the data obtained from the peak. n = (5.54Vr2)/Wh2 Where, ‘n’ is number of theoretical plates per meter, ‘Vr’ is the distance along the base line between the point of injection and a perpendicular dropped from the maximum of the peak of interest and ‘Wh’ is the width of the peak of interest at half peak
The substitution reaction was successful but not fully effective. 19. If the data was inconclusive, then comparing various compounds and the unknown based on physical characteristics would be the first step, titrations would also be a good method. 20. To get a better yield, redoing the experiment would require careful attention in the recrystallization steps: amount of solvent used, how hot solvent is, if the mixture cools to room temperature before placing it in an ice
Light intensity is one of factors affecting photosynthesis. Depending on distance of light intensity, the result would be changed. Prior to the experiment, the distance should be settled. Even though it was expressed by using tape, it would be inexact. Therefore, improvement to the method would be to make the higher light intensities so as to be quite accurate, which denotes lamps would be adjusted to a beaker containing elodea from side to side because the smaller light intensities would be less accurate since the light spreads out, and the elodea might be exerted influence on other experiments or background light.
This can also speed up the reaction between calcium carbonate and hydrochloric acid with a higher temperature as a higher temperature can let the particles to have a higher kinetic energy for more effective collisions to have a higher rate of reaction. From the calculation, the percentage if calcium carbonate in the toothpaste is found to be at about 20.14% which has a small difference from the literature value of 20%. This maybe cause by the errors when carried out the experiment such as parallax errors. For example, the position of eye level when taking reading or measuring which are not perpendicular to the scale of the instrument will result in the inaccuracy of the data. Next, the other error that might happen is the filter funnel is not inserted properly into the mouth of the conical flask causing some of the hydrochloric acid to be evaporated in the form of vapours.
In this experiment, it was possible to produce the major products from bromination of acetanilide and aniline. 0.075g of 4-bromoacetanilide and 0.156g of 2,4,6-tribromoanilne were collected from bromination of 0.07g acetanilide and 0.05g aniline with the percent yield of 67.57% and 88.1% respectively. At the end of the experiment, to prove the formation of the major products, melting point of the products were measured. The melting point of the product from the bromination of acetanilide was 164.8-168.50c, which is in the range of the melting point of 4-bromoacetanilide, 165-1690c, as reported on the Chemical Book, CAS Database List (chemicalbook.com). The melting point of the product from the bromination of aniline was 119.8-121.90c, which is in the range of the melting point of 2,4,6-tribromoaniline, 120-1220c, as indicated on PubChem, Open Chemistry Database (pubchem.ncbi.nlm.nih.gov).
Hydrochloric acid is a colorless, clear, highly corrosive liquid that can cause burning. Hydrochloric acid is a very good industrial acid; it’s good for pickling iron and steel. Hydrochloric is found naturally in the stomach with the other gastric juices. Hydrochloric acid plays a role in the digestion of the food, and releasing enzymes in the stomach. Hydrochloric acid is found with the other gastric juices which are mostly potassium chloride, and sodium chloride.
CH3 175 83.06% 287-289ºC 4. -OCH3 191 86.03% 275-277ºC 5. 204 78.78% 295ºC Step-3 Synthesis of 2-Methyl benzoxazin -4(3H)-one53 (4) Anthranilic acid (0.1M, 18g) was taken in acetic anhydride and refluxed under anhydrous conditions for 4 hrs. Excess of acetic anhydride was then distilled off under reduced pressure. Obtained product was immediately used for next step.
Well, since you have oily skin, you need to look for a makeup remover that is suited for the skin that you have. Like it was mentioned before, regular makeup removers may not work very well on your skin and can even exacerbate the problem too. What's more, there are several benefits to be gained when you use the right makeup remover for oily skin such as the ones below: • It exfoliates the skin – Some makeup removers can do more than just remove makeup, they can help get rid of dead skin cells that can clog your pores along with makeup particles. This is important to reduce the irritation on your skin especially when oil and sweat combine in your pores. Although this is not recommended for daily use, you can use it once a week to help cleanse your skin so that it will be easier for you to apply and remove
Dental Stone with High Strength and Low Expansion (Type IV) After accomplishment of dehydration, another chemical such as 30% calcium chloride or magnesium chloride is added whilst boiling of gypsum product. The chlorides are later washed with hot water and since the solubilities of the hemihydrate and water are the same, it does not go into forming calcium sulfate dihydrate in presence of hot water. Furthermore, the powder that has been given out is the densest of all the gypsum types. Dental Stone with High Strength and High Expansion (Type V) The production of dental stone with high strength and high expansion is the same as type IV production. However they do differ in the way that type IV contains extra salts and therefore has reduced expansion during
I could have use a beaker or measuring cylinder to measure the volumes of acid and water, but chose a pipette because it's more accurate. Conical Flask I'm using a conical flask as it is a good way to react chemicals in because it allows a bung with a delivery tube to be connected to the top to collect the gas, whereas beakers you cannot. Gas Syringe I chose the gas syringe over the measuring cylinder in water because it allows me to see the product produced going up in smaller sizes because of the scale on the syringe. So the timer can be stopped exactly when it reaches the value needed. Bung and Delivery tube To ensure that no gas leaks out of the conical flask, so that the volume of gas inside is delivered to the syringe.