3. (a) CoCl42- ion is favored by the addition of hydrochloric acid and calcium chloride.…
Background Information: Post-1983 pennies have a copper jacket and a zinc core. We hope to determine the percent composition of these two metals. This will be done by reacting the zinc with hydrochloric acid to form zinc ions in a single replacement reaction. The acid reacts with the zinc but not copper. The reaction of zinc metal with the hydrochloric acid (HCl) produces zinc chloride and hydrogen gas. Safety: Wear your safety goggles and apron If you spill Hydrochloric acid on yourself, rinse with water Procedure: DAY I 1. Take a post-1983 penny and, using a triangular file, etch an “X” on one side of the penny. Also etch a notch on the edge of the penny in the four positions shown in the diagram. 2. Mass and record the mass of the penny. 3. Using a graduated cylinder, measure 60.0 mL of 3.0 M HCl and pour it into your 100mL beaker. 4. Place the penny in the HCl solution etch side up and record observations for 3-5 minutes. 5. Place the beaker in your lab drawer. 6. Answer question #1 for tomorrow. Read and prepare a data table for Day II. DAY II 1. Using your forceps, carefully remove the fragile copper jacket that is left from the penny. Rinse it gently in distilled water. 2. Dry the penny in acetone solution. Swirl the penny in the solution. 3. Pour the acid solution from your beaker into the waste container at the center table. Rinse and dry your beaker. 4. Take a magic marker and write your lab drawer number on the side of your 50 mL beaker. 5. Place the penny in the beaker and put the beaker on the appropriate shelf of the drying oven. DAY III 1. Mass and record the mass of the dry copper jacket. 2. Complete the questions and calculations for tomorrow.…
The purpose of this lab was to determine the atomic weight of magnesium by measuring the amount of hydrogen gas evolved when hydrochloric acid reacted with magnesium. In order to measure the atomic weight I needed to measure the amount of the hydrogen gas that was evolved in reaction to the acid of the magnesium. The reaction used was: Mg + 2HCl --> H2 + Mg2+ (aq) + 2Cl- (aq). The major findings of this experiment were that there was a chemical reaction between hydrochloric acid and magnesium, and the reaction produced the hydrogen gas. The results also indicated how many moles of hydrogen gas were equal to the amount of moles of magnesium consumed.…
In part 3 of the lab 20 drops of HCl were added to a test tube with a small zinc piece. It was then heated with a lit wooden splint in the opening. Also in part 3 of the experiment a small piece of steel wool was added to a test tube with 10 mL of 0.6M copper sulfate.…
The purpose of this lab experiment is to determine the atomic weight of magnesium by measuring the amount of hydrogen gas evolved when hydrochloric acid reacts with magnesium.…
2. The reactivity of the metal increases with each period it goes down. Magnesium is the least reactive and is in the third period with an atomic number of 12. Calcium is slightly more reactive being in the fourth period and having an atomic number of 20. Barium is the most reactive because it is in the sixth period and it has an atomic number of 56. So the farther down in the group they go the more reactive they are.…
In part c of the experiment we were asked to list the 4 alkaline earth metals in the order which they should appear in group 2 of the periodic table based on our observations. I came the conclusion that they should appear as (Mg, Ca, Sr, Ba) from top to bottom respectively. I came to this conclusion since I know mass increases from top to bottom of the periodic table and the reactions with more precipitate and color would have a greater mass. So I observed the Relative Soluabilites of some Salts in Alkaline Earths table and saw that Mg had the least…
1) The reason why the reaction started very slowly then increased after a few minutes is because the hydrochloric acid has to first dissolve the protective layer that coats zinc. As the layer dissolves, more metal is exposed to the acid, therefore it begins to react.…
In this experiment, we use the unknown metal (which is Magnesium, Aluminum, Tin, or Zinc) to react with hydrochloric acid. Base on the mass of the unknown metal and the mass of residue to figure out what element is the unknown metal. By using stoichiometry, the…
Purpose: The purpose of this lab is to investigate the reliability of the activity series of metals by testing in solution, confirming if the activity series was correct with its predictions.…
An elements¡¦ reaction to certain substances may be predicted by its placement on the Periodic Table of Elements. Across a period, an element on the left will react with more vigor than one on the right, of the same period. Vertically, as elements are sectioned into groups, the reaction of each element increases as you move down in the same group. With this in mind, the reactions of the substances involved in this experiment may be hypothesized, observed, and validated.…
4 women in their early 20s were attacked by a 41 year old mentally unstable woman.…
The objective of this experiment was to observe evidence of a reaction and to determine the chemical equation, if there is a reaction. In order for a reaction to occur, a metal strip must have evidence of black or grey deposits on the surface of the metal once dipped into the solution. The reactivity of an element is related to its tendency to lose or gain electrons. Three metal strips that were used are copper, lead and zinc as well as the solutions of silver nitrate, copper(II) nitrate, lead(II) nitrate, magnesium sulfate and dilute(3M) sulfuric acid. The copper metal strip was placed in the silver nitrate and dilute(3M) sulfuric acid, the lead metal strip was placed in the copper(II) nitrate and the zinc metal strip was placed in the lead(II) nitrate, magnesium sulfate and dilute(3M) sulfuric acid. Overall, putting these different strips of metal into different solutions will help determine the reactivity of copper, lead, zinc, magnesium, silver and hydrogen.…
1. The use of microscale techniques does not change the hazardous nature of the reagents we use. Briefly…
In my experiment I have found that 50 millilitres of HCL with 2 grams of sodium chloride had the highest conductivity rate compared to the second most conductive solution, 50 milliliters of vinegar with 2 grams of sodium chloride, and the last conductive solution, 50 milliliters of distilled water with 2 grams of sodium chloride. In my first hypothesis I stated if I added sodium chloride to distilled water, than the overall conductivity will become more conductive than just distilled water, since the sodium chloride will break down into it’s respective ions. I also noted the solution will however be less conductive compared to vinegar and HCL also encompassed in 2 grams of sodium chloride. Judging by my final results and several attempts, I…