Identification of Unknown Solutions and Ammonium Salts preAice Chemistry Lab Report Descriptions of unknown solutions: Unknown Descriptions A Clear, colorless, odorless liquid. B Clear, colorless, odorless liquid. C Clear, red-brown, odorless liquid D Clear, yellow-orange, odorless liquid. Observations of unknown solutions: Unknown NaOH HNO3 & AgNO3 Diluted HNO3 & BaCl2 HCl A No reaction (+)Yellow ppt. formed Did not test (+)Effervescence (bubbles) B No reaction (+) Yellow ppt. Formed No reaction No reaction C (+) Rusty-brown ppt. No reaction No reaction (+) White ppt. D (+) Green ppt. (+) White ppt. No reaction No reaction Conclusion for solutions: In the unknown A solution it cannot be determined what the cation and anions of the solution are, however it is possible that the cation for unknown A could be represented through the equation: __2CO3(aq)+NaOH(aq) -->__OH()+Na2CO3(aq) and possible …show more content…
In attempt to identify Unknown A three different reagents were used. In the first test five drops of NaOH was added to Unknown A, no apparent reaction occurred therefore there was no cation present. Another fraction of Unknown A was tested with diluted HNO3 and five drops of AgNO3 which formed a yellow precipitate however, it was later discovered that this test was a false positive for anions. A final fraction of Unknown A was tested with five drops of HCl to test for CO3 anions. The result of this test was effervescence (bubbles), this suggested that Unknown A was positive for CO3. The chemical equation for the cation of Unknown A is: ___2CO3(aq) + NaOH(aq) →___OH + Na2CO3(aq), because there was no reaction when NaOH was added to the solution, the only possible cations would be an alkali, NH4, Ba, Sr, and Ca. The chemical equation representing the anion is ___2 CO3 (aq) + HCl (aq) → ___Cl (aq) + H2O(l ) + CO2(g) with the same selection of
Determining Unknowns Through Distillation Introduction Distillation is a technique of separating two miscible liquids by their boiling point differences. This experiment uses distillation to separate and identify two unknown compounds. The two types of distillation are simple and fractional. Simple distillation is used to separate miscible liquids that have a boiling point difference of 100 C or more, while fractional distillation is used to separate miscible liquids that have a boiling point difference of less than 100 C. Simple distillation and fractional distillation have two similar but different apparatuses. The fractional apparatus is set up the same as a simple apparatus, but a column packed with steel wool is added in between the boiling
If I had a household product labeled sodium bicarbonate, I would add an acidic substance and expect bubble to be created. As we know acid reacts with bubbles when combined with sodium bicarbonate. 2. Write the chemical equation for the reaction in well A6. B BoldI ItalicsU Underline Bulleted list Numbered list Superscript Subscript3 Words NaOh + AgNO3>>>>NaNO3 + AgOH 3.
However, after refluxing for a while, yellow precipitates begin to form near the top of the flask. It was assumed that the remaining starting material was concentrated from a decrease volume to reappeared in solution. Nevertheless, this may have been a sign of contamination that will negatively affect the entire reaction. This observation later resulted in a yellowish
Abstract: The purpose of this experiment was to identify given Unknown White Compound by conducting various test and learning how to use lab techniques. Tests that are used during this experiment were a flame test, ion test, pH test, and conductivity test. The results drawn from these tests confirmed the identity of the Unknown White Compound to be sodium acetate (NaC2H3O2) because there were no presence of ions and sodium has a strong persistent orange color. The compound then will be synthesized with the compounds Na2CO3 and HC2H3O2 to find percent yield.
Stoichiometry is a method used in chemistry that involves using relationships between reactants and products in a chemical reaction, to determine a desired quantitative data. The purpose of the lab was to devise a method to determine the percent composition of NaHCO3 in an unknown mixture of compounds NaHCO3 and Na2CO. Heating the mixture of these two compounds will cause a decomposition reaction. Solid NaHCO3 chemically decomposes into gaseous carbon dioxide and water, via the following reaction: 2NaHCO3(s) Na2CO3(s) + H2O(g) + CO2(g). The decomposition reaction was performed in a crucible and heated with a Bunsen burner.
Introduction The purpose of this week’s lab was to enhance our understanding of the Grignard reagents that were examined in lecture. In this lab, a Grignard reagent will be prepared through the reaction of magnesium turnings and bromobenzene. Instead of isolating the product it will then be combined with benzophenone, which will give the final product of triphenylmethanol. Procedure
As the unknown acid was titrated, one of the products formed in the reaction was the ion of the unknown acid, or the conjugate base which, according to the Brønsted-Lowry theory, was formed as a result of the acceptance of a hydrogen ion from NaOH. When the moles of the unknown acid and the
Experiment 2 Report Scaffold (Substitution Reactions, Purification, and Identification) Purpose/Introduction 1. A Sn2 reaction was conducted; this involved benzyl bromide, sodium hydroxide, an unknown compound and ethanol through reflux technique, mel-temp recordings, recrystallization, and analysis of TLC plates. 2. There was one unknown compound in the reaction that was later discovered after a series of techniques described above.
The solution of DCM and cyclohexane was clear and colourless. The following graph shows the recorded
Verna Wang Hannah Palmer CHEM 101-069 Lab 11-19-16 Stoichiometry and Limiting Reagents Lab Report Purpose: We are using the reaction of sodium hydroxide and calcium chloride to illustrate stoichiometry by demonstrating proportions needed to cause a reaction to take place. Background: Just like a recipe would call for a specific amount of one ingredient to a specific amount of another, stoichiometry is the same exact method for calculating moles in a chemical reaction. Sometimes, we may not have enough of or too much of one ingredient , which would be defined as limiting and excess reagent, respectively.
1.Chemical properties Elemental mercury (Hg) has an atomic weight of 200.59 u, oxidation states 0, +1 and +2. Is a liquid and volatile metal soluble in water to some extents? In the oxidation states +1 and +2 is able to form organic compounds of type RHgX and R2Hg where R can be alkyl- or Aryl groups. The RHgX compounds properties depend on the nature of the X rest; If the organic compound contents hologenides the result is a highly lipophilic compound whereas If the rest is oxygen anion, chemically stable, thermally labile and light sensitive compounds are formed. Nevertheless, away from the properties differences, both kind of compounds are crystalline.
This verified the formation of the major products. Overall, one can say that the experiment was
Properties of Ionic and Covalent Substances Lab Report Introduction The purpose of this lab was to determine which of the following substances: wax, sugar, and salt, are an ionic compound and which are a covalent compound. In order to accurately digest the experiments results, research of definitions of each relating led to the following information: ionic compounds are positive and negatively charged ions that experience attraction to each other and pull together in a cluster of ionic bonds; they are the strongest compound, are separated in high temperatures, and can be separated by polar water molecules. A covalent compound forms when two or more nonmetal atoms share valence electrons; covalent compounds are also
Commercial vinegar, Yamaha brand 0.1 mol/dm3, NaOH soloution Phenolpthalein indicator soloution (50.00 ± 0.5 cm3 ) cm3 burrete (250.00 ± 0.5 cm3) volumetric flask a (250 cm3± 0.5 cm3)