In order to find the equivalent weight a titration of the unknown acid had to be conducted. Equivalent weight is the weight of the substance in grams divided by the average molarity of the sodium hydroxide solution times the volume from the titration in liters. If the molarity of your sodium hydroxide solution were too low then the equivalent weight would be off significantly. In order to calculate a decent molarity a short series of titrating was conducted using KHP. Find the molarity is essential to numerous amounts of future procedures such as equivalent weigh.
Observing Changes – Materials & Procedures Materials Water Copper (II) sulphate (Powder) Copper (II) sulphate solution Iron nail Sodium carbonate Hydrochloric acid Magnesium ribbon Flame (candle) Sugar Aluminum foil Test tubes Test tube rack Tongs Medicine dropper Spoons Beakers Safety goggles Scoopulas Procedures Water and Copper (II) Sulphate Procedure 1. Add a small amount of solid copper (II) sulphate to a test tube with a scoopula. Record the physical properties. 2. Write a hypothesis on what you think will happen when water is added.
Lesson written by Carolina Sylvestri Experiment: Reaction Between Ions in Aqueous Solutions The Monster Mash Background: Ionic solids dissolve in water to form aqueous solutions which conduct electricity. These solutions contain both positive and negative ions in such numbers that their net electric charge is zero. In this experiment, you will mix various ionic solutions, two at a time, to determine which combinations form precipitates. Knowing which ions are present makes it possible to deduce which of the possible ion combinations are responsible for the precipitates. From your data table, it will then be possible to generate a solubility table.
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According to the Revell's lab experiment, aspirin, acetaminophen, caffeine recoveries are 60% or higher, <10% and <5%, respectively. The reason for such a low percent recoveries for acetaminophen is due to a formed solid is too fine to be filtered, and for caffeine is due to its low solubility in diethyl ether(1.8mg/ml) than in water (22mg/ml). Not only caffeine's solubility in water can affect its percent recoveries, but also it can affect other two compounds by contaminating with caffeine. For the TLC, expected approximate Rf values for aspirin, acetaminophen, and caffeine are 0.6, 0.3, and 0.1 , respectively. Procedures A.
The following mistakes were made when carrying out the experiment. What effect does each have on the calculated molar mass? Be specific. For example, too large because… Only part of the pipet was immersed in the boiling water, so the temperature in part of the pipet was less than that of the water bath. If the temperature was less than the water bath in some places because only part of the pipet was immersed in the boiling water, the molar mass calculated would become lower.
Each of the analyte will have its own Rf value under certain circumstances. The separation of the phospholipid classes can be improved by two-dimensional chromatography. This technique requires developing the TLC plate in a direction, then dried, and developed in a solvent mixture at a 90 ° the first development (Singh and Jiang,
________________________________________ Chart 1.2: the difference between the readings in each of the trails. Chart 1.3: the difference between the sum and the average. CONCLUSION AND EVALUATION CONCLUSION: Equivalence point is the point at which the moles of H+ is equal to the moles of OH+,an indicator is used to show the equivalence point during a titration. in a titration the method is about totaling one reactant from the burette (regularly the acid),to a known volume of the other reactant in a conical flask(regularly the base) . In order to find the concentration of NaOH we need to tag along the following steps: a- note down the balanced chemical equation for the reaction C8H5O5K+NaOH→C8H4O4KNa+H2O b- pull out applicable information from the experiment: C8H5O5K V=0.025 dm3 C=0.2M NaOH V=0.021 dm3 C= ??
Next the freezing point which didn’t eliminate either of them. Next we look at the mass which was 7.465g/ml. This make me lean toward ethyl ether but the masses were still pretty close. Next we move to the solubility of the substances. They are both very soluble in alcohol and hexane so that doesn’t help, but in water ethyl ether is semi soluble and pentane is in soluble.
In this lab we synthesized and analyzed potassium aluminum sulfate (KAl(SO4)12H2O) using a multiple different tests. These test included flame test, melting point, potassium test, sulfate test, and aluminum test. We also determined the number of waters of hydration in Alum. Experimentally and empirically potassium aluminum sulfate is a dodecahydrate (4). The purpose of the laboratory is to determine the number of waters of hydration in aluminum potassium sulfate as well as the purity of the Alum we produce.