Anion Analysis Lab

b) Iron and Barium were present in unknown 3. Assigned unknown reacted with all 4 reactants and formed precipitate with 3 of them (Sodium carbonate, sodium hydroxide and Sulfuric acid). During the experiment it reacted very similarly to Iron (III) nitrate and Barium nitrate. For example, with it was tested against Ammonium Chloride, the color of the solution changed to a light green, very identically to Iron (III) nitrate and Ammonium Chloride. Besides, unknown 3 formed an orange brownish precipitate when it was tested with sodium carbonate. Iron (III) nitrate acted similarly. Moreover, unknown 3 reacted similar to Barium nitrate when it was tested against ammonium chloride and sulfuric acid. It did not form any precipitate with ammonium chloride but formed a very light white precipitate, which is identical to barium nitrate’s reaction against sulfuric acid. Therefore, the two present metal in unknown 3 are Iron and barium.

The purpose of this lab is to find if the mass changes when you galvanize and put a penny in the flame of a Bunsen burner introducing it to heat. In this lab, you galvanize eight pennies to silver and then heat up four of the silver pennies and make it into brass with the Bunsen burner. The independent variable in this lab is the penny because we have control over of what kind of penny we use rather it be new, old, dirty, or clean. The dependent variable in this lab is the mass of the penny because we are measuring the mass of each penny. Finally, the constant in this lab is the sodium hydroxide because; we use the same amount throughout the whole entire lab.

The three elements that I will be looking at are Krypton, Arsenic, and Potassium. These elements are all very different but share some similarities even with their separate placement on the periodic table. I chose these elements because they are the most different of the six elements that I chose to do this project on. Arsenic is the first element we will be looking at. Arsenic is a metalloid because it shares some characteristics with metals and some with nonmetals.

The number of electrons forming a charge cloud around the nucleus is (pick one of the following) greater than; equal to; smaller than the number of protons in the nucleus of the atom.

In reference to the analysis of anions, Table 1 shows that a precipitate was formed when our unknown was combined with HNO3 and AgNO3, thus indicating the presence of a chloride ion. Because our unknown did not form a precipitate due to HCl and BaCl2, separate, effervesce, or smell, we concluded that neither sulfate, nitrate, carbonate nor

1-1: Insert the chemical symbol in the answer blank for each of the following elements.

These different elements

-Henry Gwyn Jeffreys Moseley- Worked with Ernest Rutherford, experimented with 38 metals, he found that the positive charge of each element’s nucleus increased by one from element to element as they were arranged in Mendeleev’s periodic table, lead to modern definition of atomic number (# of protons in atom’s nucleus) and the recognition the

The point of the experiment was to determine whether the chemical mixture will form a precipitate. The first step was to combine compound 1 and compound 2. After mixing them together, if a solid was created, a precipitate formed. Also for many of the chemical mixtures, the color changed. Silver Nitrate + Sodium Chloride created a precipitate.

The name apatite refers to a subgroup of endmembers inside of a group, which are all included in an apatite supergroup. Apatite popularly refers to Ca5(PO4)3(F,Cl,OH), but there are over 40 known species of this mineral.

The cations in both the known and unknown samples were identified by using qualitative analysis, of which were determined to be acidic, basic, or neutral by using litmus paper. Acid-base reactions, oxidation-reduction reactions, and the formation of complex ions are often used in a systematic way for either separating ions or for determining the presence of specific ions. When white precipitate formed after adding hydroxide, aluminum ion was determined to be present in the solution. However, nickel was determined to test positive when the solution changed to a hot pink color after adding a few drops of dimethylglyoxime reagent and iron was present when the solution was a reddish brown color when sodium hydroxide was added to the mixture at the very beginning of the experiment. Qualitative analysis determines that ions will undergo specific chemical reactions with certain reagents to yield observable products to detect the presence of specific ions in an aqueous solution where precipitation reactions play a major role. The qualitative analysis of ions in a mixture must add reagents that exploit the more general properties of ions to separate major groups of ions, separate major groups into subgroups with reactions that will distinguish less general properties, and add reagents that will specifically confirm the presence of individual

(20) Metals are classified variously—according to molecular weight (“heavy metals”), according to chemical properties (periodic table), according to toxicology. Please do the

In the nucleus of an atom there are protons and neutrons the number of protons and neutrons depends on the element and ,if it is an isotope of that element. E.g. carbon 12, carbon 12 has six neutrons six protons and 6 electrons . Electrons are located around the nucleus of the atom. Electrons are in shells, the shell closest to the nucleus is 1 , the one after 2 and so on. Each shell can only hold up to a certain number of electrons . the first can hold up to 2 , the second 8 (2+6) the third up to 18 (2+6+10). The general formula for finding out how many electrons a shell can hold is 2n^2. Electrons have a negative charge , while protons have a positive and neutrons have no charge. A atom has the same number of protons and electrons. An ion is formed when an atom loses or gains a electrons .

It has eleven protons/electrons and twelve neutrons. Sodium is in group one which is referred to as the alkali metals. It is in group three which means it has 3 rings. It has two electrons in the first ring, eight in the second,

The main objective of this experiment is to carry out qualitative analysis to identify metal cations in unknown solution 1.