Water quality indicators

standard because it is a very pure concentrated substance that can be predicted. However, the sodium hydroxide is too difficult to be measured because of its tendency to absorb water vapor. This is one area where error can be noted; at times the sodium hydroxide was exposed to an open atmosphere where it could have absorbed water vapor from the lab. In table 1, the molar concentrations should have all equaled 0.1 mol/L. In this case it did not, trials one, two and three averaged about .2026…

Antacids are a class of medicine which assist to balance the acidity/ pH balance in your stomach. The pH system is a scale which measures how acidic a substance is or how basic a substance is or if a substance is neutralized. Antacids have the ability to give relief for heartburn, indigestion or symptoms of acid reflux. There are many types of antacids such as calcium, aluminum and magnesium. They’re many ways to consume antacids such as liquids, tablets and chewable tablets. The experiment will…

Discussion: Each test is a pertinent contribution to drawing an educated conclusion. After performing the gram staining and observing which unknown culture was gram positive, a catalase test was performed. The catalase test allows lab workers to differentiate Staphylococci and Streptococci genus. The test was performed only on the gram-positive culture. Bacteria that respire by the use of oxygen, otherwise known as aerobic respiration, produce enzyme or “catalase”. This protects the bacteria…

because Borax is placed in distilled water to create a Borax solution, the Borax breaks down into particles; the particles of Borax are random in the solution and are very disordered, meaning that the entropy increases; the positive sign of deltaSrxn shows the increase in disorder. To calculate deltaHrxn: (19573 K)(8.314 J/mol*K) =162729.922 J/mol (1/1000) = +162.73 kJ/mol. The positive sign of enthalpy change makes sense because when borax is dissolved in distilled water, the bonds are broken.…

citrate, citric acid, Water for Injections Ph. Eur. These excipients consist of properties that aim towards the proper functionality of Nimotop. They consist of inherent stabilities that cause little or no effect in the stability of the drug and they do not have any acute or chronic toxicity. The excipients are also added into the Nimodipine 0.02% solution to enhance the biological activity of the drug. Nimodipine is a yellow crystalline substance which is insoluble in water. Insoluble drugs…

cool to room temperature, and record the observation. Fifth, zinc, place one ml of 0.1 M zinc nitrate solution into a test tube and add drops of 6M ammonium chloride solution. Add one drop of ammonium hydroxide and thioacetamide and heat it on the water…

The list of errors start from the beginning of the experiment. Although the numbers seem to be close to the actual values, there is still room for error with the numbers. What the class noticed first is that we could have been working with very impure benzoic acid. The benzoic acid we were given was made by the 102 chemistry students, meaning that it wasn’t properly made. Students have said that they were rushed and weren’t able to take their time to filter the solid out of the solution. We had…

Introduction Although, in general, salts are known for their solubility, not all types of salts completely dissociate in water. Some of them partially dissociates and creates a dynamic equilibrium due to the instances when their ions recombine to form the original salts. An example of this is potassium hydrogen tartrate (KHC4H4O6 or KHT). When KHT is placed in water, it partially dissolves and forms K+ and HC4H4O6- ions. This reaction is shown below: KHC_4 H_4 O_6 (s)⇄ K^+ (aq)+HC_4 H_4 O_6^-…

coordinate the recruitment, retention and development activities (Boxall 2011) of warehouse staff. In addition to a daily communication of the IFOT metric to several stakeholders, which can be used for workforce planning in an ongoing manner as a lagging indicator. 7.2 Hussmann Weaknesses The weaknesses…

deionized water to form the Ascorbic Acid Solution Preparation of NaHCO3 solution The baking soda was measured to 0.5 grams and was mixed with 50 mL of deionized water to form the Sodium Bicarbonate Solution. Experimental Concentration of NaOH M = Molarity or Concentration Known moles of NaOH divided by known volume is equal to experimental concentration times experimental volume. Experimental Concentration = 0.3 M Experimental Concentration of…