After adding Iodine salts, and filtering the mixture our next goal was to test for three important chemicals that must exist in our mixture for it to be a true iodine tincture; Iodine, Iodide Ion and the triiodide ion. After several tests and comparisons of observations with their standards it was found that our tincture had all three chemicals present and therefore was ready for use. Focus Questions * How can I make a pharmaceutical product from seaweed? A pharmaceutical product can be made from seaweed by placing the sea weed in water and using heat energy to interact and break the bonds in the sea weed. Then by filtering, iodide can be extracted which when combined with other substances can make an iodine tincture, that is a pharmaceutical product.
Mount the buret on the ringstand and fill it above the zero mark with the prepared sodium hydroxide solution. Open the stopcock and allow the buret to drain until the liquid level is at zero. Make sure all the air bubbles are out of the tip of the buret. Read and record the intial buret reading to the 0.01mL. Place the 125mL flask containing the first KHP
Set up the vacuum filtration apparatus. Pour the prepared solution into the flask. Decant the solution evenly into two beakers. For the first beaker, we add 1 mL of 0.1 M nickel (II) nitrate. The purpose is to test the presence of excess carbonate in to solution.
This solution was placed in a burette and 18.4 cm3 was required to neutralise 25 cm3 of 0.1 moldm-3 NaOH. Deduce the molecular formula of the acid and hence the value of n. 5. Sodium carbonate exists in hydrated form, Na2CO3.xH2O, in the solid state. 3.5 g of a sodium carbonate sample was dissolved in water and the volume made up to 250 cm3. 25.0 cm3 of this solution was titrated against 0.1 moldm-3 HCl and 24.5 cm3 of the acid were required.
Then after agitating the seaweed to remove monosodium glutamate and pouring off the water, 40 mL of distilled water was added to the seaweed and heated. During this procedure, the iodine extract was filtered and several tests, both standard procedure and home- Objective: The purpose of this experiment is to understand how a single substance can be isolated from a mixture, like seaweed and water. Also, learn how to utilize filtration and extraction to make a tincture for testing for Iodine, Iodide Ion, and Triiodide Ion. Procedure: 1. 6 grams of dried seaweed, cut into ½ inches should be places into a 150 mL beakers that will later be filled with ¾ distilled or deionized water.
The normality of the unknown base is calculated after the solution has reached the end point. The amount of substance being delivered is calculated in units of equivalents per litre using the formula: VaNa = VbNb Experimental In order to titrate the acid with the unknown base, a solution of the acid was prepared. 5.1722 (±10%)g of potassium hydrogen phthalate acid is obtained using a weighing boat and transferred into a volumetric flask containing 250mL of boiled distilled water. Volumetric flask was shaken several times in order to assist the powder to dissolve. Once dissolved, 24.9734 (± 0.0045)mL of acid was pipetted into an Erlenmeyer flask along with 25mL of cool (recently boiled) distilled water.
After the solid was dissolved, 230mg of methyl salicylate was added using a graduated pipet to the NaOH solution. A white solid was soon formed. And a boiling stone had been placed in the flask to prevent bumping of the solution when it was heated. After grease was lightly coated to the lower ground glass joint of the condenser, a water-cooled reflux condenser had been attached. The reflux apparatus was place in the aluminum block.
Titration Aim Part A: To prepare a primary standard and use it to determine the concentration of a sodium hydroxide solution. Part B: To monitor the neutralisation of dilute vinegar by a standardised sodium hydroxide solution to determine the concentration of acetic acid in dilute vinegar. Equipment • 250mL volumetric flask • Oxalic acid dehydrate crystals • Beaker (150mL) • Small funnel • Phenolphthalein • Burette • Wash bottle with distilled water • Electronic balance • Pipette (25mL) • 2 x Beaker 50mL • Burette clamp and stand • Pipette filler • Spatula • Glass rod • pH meter and data logger • Standardised NaOH solution • Diluted vinegar (150mL diluted into 1L with distilled water) • Sample of 0.1mol/L sodium hydroxide solution • Magnetic stirrer with stirrer • 100mL measuring cylinder Method Part A: Preparation of Standard Solution 1. The molar weight (M) of oxalic acid dehydrate was calculated. 2.
The chemical equation to be used is : 2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) In the second part, 1.0 M HCl will be titrated into a solution with a known amount of sodium carbonate (Na2CO3), the pH will be measured as it becomes more acidic and the equivalence point (the point at which HCL and Na2CO3 reach equilibrium) determined. We will calculate the moles of Na2CO3 by dividing the grams used by the molar mass of sodium carbonate. Then, the moles of HCl required to neutralize Na2CO3 will be determined by using the mole to mole ratio in the chemical equation. Finally, the molarity
Kimberly Lanese August 27th 2014 Intro to Chemistry Top Loading Balance 1. How is the balance turned on? In order to turn the balance on we need to push down on the bar until numbers show up on the screen of the scale. 2. Write a complete and accurate procedure for weighing a chemical on the top loading balance.