Safety goggles and lab apron must be worn for the experiment. 2. Fill a 250 cm³ beaker about 2/3 full with water. Place the beaker of water on a hot plate or ring stand with the wire gauze. Begin heating the water to the boiling point 3.
Place it on the stand and begin heating it to the boiling point (100 degrees Celsius). 3. Measure the mass of the zinc to be tested. 4. Place the test tube, with the zinc in it, in the water and continue heating.
Set min temperature to 15-18C c. Time should range from 0-250 seconds 7. Press DISPLAY to accept all values 8. Heat up 200mL of water in a microwave for about two minutes 9. Place hot water on a hot plate to keep warm 10. Nest one Styrofoam cup in another 11.
Gravimetric Determination of Sulfate Purpose The purpose of this lab is to determine the percentage of sulfate in the hydrate by precipitating the sulfate as barium sulfate. Materials Filler paper Sodium sulfate Graduated cylinder Bunsen burner Watch glass Beakers (250 mL, 400 mL) Rubber bulb Graduated pipette Beaker tongs Funnel Filter Paper Sodium Sulfate Drying oven Wash bottle Stirring rod Silver nitrate Hydrochloric acid Distilled water Small test tube Procedures First, .4861 grams of sodium sulfate was placed into a clean 400mL beaker. Exactly 200mL of water and 1mL of HCl was added to the same beaker. A watch glass was placed on the beaker and the solution was heated using the Bunsen burner to a gentle boil. The watch glass was removed with the beaker tongs.
Repeat the titration until there are two titres within 0.1cm3 of each other. Record results in a suitable table. Results: Rough Titre: 7.653 First Run: 6.553 Second Run: 6.453 Third Run: 6.553 Calculations: During the titration, iron(II) ions are oxidised to iron(III) ions and manganate(VII) ions are reduced to manganese(II) ions. The equation is as follows: 5Fe2+(aq) + MnO4-(aq) + 8H+(aq) ? 5Fe3+(aq) + Mn2+(aq) + 4H2O(l) The above equation shows that one mole of manganate(VII) ions reacts with 5 moles of iron(II) ions in acid solution.
Obtain a boiling tube, a large test tube and a small test tube. Label the boiling tube “R” 2. Using an electronic balance, weigh out two grams of granular zinc and record the mass. Weigh out two grams of iodine crystals, record the mass and add this all to the boiling tube labeled “R”. 3.
DO NOT LOOK DIRECTLY AT THE BURNING MAGNESIUM; THE INTENSE LIGHT CAN HURT YOUR EYES. The magnesium mass was calculated from the data in the lab table during the heating process. The reaction was complete when the gray powder was formed. Tongs were used to carefully remove the reaction off of the wire gauze to cool for five minutes. Two drops of water were added to the cooled crucible.
The mole can be also defined as the number of atoms in exactly 12g of Carbon. In this experiment, the magnesium will be heated and this magnesium will react with the oxygen in the air to form magnesium Oxide. DIAGRAM: METHOD: 1. An empty crucible and its lid were weighed on an electrical balance. The mass of the crucible and its lid were recorded.
Lab 4: Determination of Percent by Mass of the Composition in a Mixture by Gravimetric Analysis Introduction Thermal gravimetric analysis is used to determine the percent by mass is used to determine the percent by mass of a component in a mixture. When a mixture is heated to an appropriately high temperature, one component in the mixture decomposes to form a gaseous compound. The mass of this particular component is related to the mass of the gaseous compound. In this experiment, the percent by mass of sodium hydrogen carbonate (NaHCO3) and potassium chloride (KCl) in a mixture will be determined. Experimental First, we weighed 2 samples, each has 1 gram of NaHCO3-KCl mixture Second, we put the samples in 2 crucibles (A and B) and weighed them.
It was been noted whether the substance melts at high or low temperature. Test 3: Conductivity of solid. Electrodes of the conductivity circuit were placed on a fragment of the solid it was observed whether there was a current flow or not. Test 4: Solubility in water. A small amount of solid was placed in a test tube.