Discovering the Mystery of Eleven Test Tubes Essay

Suppose a household product label says it contains NaHCO3. How would you test this material for the presence of sodium bicarbonate?

metal nitrate salts which remained unknown until it was identified at the end of part A. Part B of

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

3. Examine the luster of the minerals in Figure 1.2 (p. 4 lab book). Place the letter A, B, C, D, or E in

Experimental Method: A filtration apparatus was set up. Solid iron(III) chloride hexahydrate was dissolved in water. In a separate container, sodium acetate trihydrate (NaC2H3O2 x 3 H2O) was also dissolved in water. Sodium acetate trihydrate was then added to iron(III) chloride. 2, 4-pentanedione (C5H8O2) was dissolved in methanol; it was then added to the iron(III) chloride/sodium acetate solution. The product of this mixture was filtered, and the precipitate

The compound was tested for the presence of ammonium, carbonate, sulfate, chloride, and nitrate, as seen in Table 2. The nitrate test produced a precipitate, indicating the presence of the nitrate ion in the compound. At this point it was hypothesized that our unknown compound was calcium nitrate.

2. If the mineral is non-metallic, decide if it is light or dark in color.

We repeated this for a total of 6 known substances and 3 unknown substances. We also made a table for each element showing the color of the flame that we saw,

The flame test had a variety of results. Most of the known compounds did not match our unknown except for Ca(NO3)2. Both Ca(NO3)2 and the unknown compound had a deep red/orange color flame. While Ca(NO3)2 had the closest results two other compounds had slightly different results but not different enough to rule them out. Those other two compounds were CaCl2 with a yellow/ orange color and CaCO3 with a reddish color.

The most reactive substance in this lab was the crushed liver core, it produced the most amount of heat, bubbles, and the biggest flame during the glowing splint test. The manganese dioxide and the liver core were also very reactive and they both produced a flame during the glowing splint test. Next, the potato core produced a slight reaction, but it was not as extreme as the other substances. Finally, just the hydrogen peroxide and the boiled liver core had no reaction and did not produce a flame during the glowing splint test.

Seven test tubes were labeled numerically with 2 mL of VO3- and H2SO42- added to each tube. A small pea size portion of solid Na2SO3 was added to the first test tube. Then, 20 drops of distilled water were added to the second test tube. In the third test tube, 20 drops of (.2 M) NaBr were added. Then, to drops of (.2 M) NaNO2 were added into the fourth test tube. A small portion of Fe(NH4)2(SO4)2 * 6H2O was added into the fifth test tube. The sixth test tube had 20 drops of (.2 M) H2Cr2O4 added, where the seventh test tube was the control tube with no additional chemicals added. All the test tubes were left to react for 3 minutes and then heated in a heated bath for approximately 20 minutes.

Place 2 ml of 0.1 M Na2SO4 solution in a test tube and 2 ml of your unknown in another test tube. Add 1 ml of BaCl2 to each test tube. Add 10 drops of 6 M HNO3 to each test tube. Any white solid that remains is BaSO4. The color of unknown B was clear while the color of Na2SO4 was milky, which means SO42- was present.

Predicting Precipitations Lab Report: explanation data of lab along hypothesis, and identifying possible errors of lab for further investigations. The reactions from 1A through 1D all have a precipitation formed because physical changes appeared. AgNo3 is a clear solution; when it is mixed with a yellow FeCl3, a precipitate is formed in a different color than the original colors. After a while, the precipitate became slightly solid. For 1B and 1C, the solid was formed in similar ways, it might be because both reactants contains a similar element.

Sodium metal is extremely reactive in comparison to hydrogen due to its ranking in the activity series, and when combined with water, it would displace one of the hydrogens in a water molecule, forming NaOH, also known as sodium hydroxide (Beran, 2014). This compound is known to be basic because it can donate a hydroxide ion, and all basic substances turn litmus paper blue (Beran, 2014).

Nitrogen was discovered to be the fifth most abundant element in our universe, it’s also not flammable, but it is reactive due to the nitric acid.