Chemistry 1 1/20/13 MODEL CHEMLAB EXPERIMENT: CATION AND ANION “ THE CHEMISTRY REACTION” Introduction The purpose of this experiment is to demonstrate a double replacement reaction of ionic compounds. We will be demonstrating The reactions of ionic compounds that are supposedly soluble in water, If a reaction should occur during this experiment, then one of these ionic compounds are identified as not being soluble in water and a precipitate will occur. We may ask ourselves, what is ionic compounds?, Ionic compounds simply are where two or more ions are held next to each other by electrical attraction. One of these ions have an positive charge (cation +) and one will have a negative charge (anion -). Let’s experiment and observe Whether these ions will have a reaction or indeed soluble in water.
2. Data table #1 (for the pure solvent) and Data table #2 (for the unknown MW determination) with all the data (like those found on page 13 of the lab manual). Results table #3 with all the data (like the one found on page 16 of your lab manual). Please be sure to include your partner’s name. Partner: Tyler Smith Data Table #1 Pure Solvent Mass of test tube + cork 45.502 g Mass of test tube, cork, + p-xylene 70.199 g Mass of p-xylene 24.697 g Data Table #2 Unknown Molecular Weight Determination Unknown letter C Mass of solid unknown 2.256 g Data Table #3 Results Freezing point of P-xylene, T°f 13.4 °C Freezing point of solution, Tf 10.8 °C Value for ΔTf 2.60°C Molality of unknown solution, m 0.60 m Mass of p-xylene, g 24.697 g Mass of p-xylene, kg 0.0247 kg Mols unknown solution 0.015 mols Mass of unknown added 2.256 g Molecular weight of unknown solute 1.5 x 10 2 g/mols 3.
He conducted tests and found reactions that gave rise to benzaldehyde and benzoic acid, which led him to conclude the compound contained a benzene ring (Phenylketonuria, n.d.). Further testing showed the melting point to be the same as phenylpyruvic acid, which indicated that the substance was in the urine (Phenylketonuria, n.d.). His careful science inspired many to pursue similar meticulous and painstaking research with other disorders (Phenylketonuria, n.d.). 1.2. Causes Phenylketonuria (PKU) is an inherited, autosomal recessive disorder (Letcher, 2002).
UNKNOWN ACID AND BASE TITRATION Introduction The purpose of this experiment was that we explored the use of titration by adding small quantities of base to an acid and recording the rise of the pH on a graph so we can see the equivalence point. In this lab we used a strong acid and a strong base to perform the acid base titration. Strong acids and bases are known to dissociate in water completely. Some of the major findings in this lab were that only a small amount of base can result in a large change in the pH. Procedure Step 1, Obtain acid, in a 100 ml Erlenmeyer flask add 35 ml of .2M HCl solution.
Materials and Methods In this experiment, there are three main parts and a variety of chemicals required to achieve a desired result. The first step for this experiment was for the student to gather the necessary materials. Vials of each type of transition metal, Fe3+, Co2+, Ni2+, Cu2+, and Zn2+, as well as solutions of 6M HCl, 1.5M HCl, 15M NH4OH, 3M NH4OH, 3M HCl, dimethylglyoxime in ethanol (DMG), and the unknown sample. Materials needed include two pieces of chromatography paper, three 600mL, two spot plates, tongs, six capillary tubes, foil, and an ammonia fumigation chamber. This experiment had two main phases, identification of transition metals and paper chromatography.
INTRODUCTION: This experiment aims to demonstrate liquid-liquid extraction. Chemicals used were 18.0 M Acetic Acid, Toluene, Phenolphthalein and 0.1M Sodium Hydroxide. In this experiment, the process of titration was used in order to determine the amount of acetic acid, which was done in three different procedures (1 trial each). The calculations took place right after accomplishing all
Flame Tests – Identifying cations Abstract: My objective of this experiment is to identify cations present in water samples. To do this I will be doing 7 experiments using different types of metal ions. To do this I will clan the flame test wire by dipping it into acid, then heat nichrome wire in a Bunsen flame until no colour is visible in the flame. Then dip the wire into acid, then into salt solutions and hold wire in edge of flame and finally note the colour of the flame, then repeating this for all the salt solutions. Introduction: This report is based upon my hypothesis taken out in an experiment.
Ocean County College Department of Chemistry Ionic Reactions Submitted by XXXX Date Submitted: July 11, 2014 Date Performed: July 9, 2014 Lab Section: Chem-180 DL Course Instructor: L. Stage Purpose The purpose of this experiment is to: -write balanced equations -study ionic reactions -write net ionic reactions Procedure -In the 96-well plate -place 2 drops of cobalt (II) nitrate into seven of the A wells -place 2 drops of copper (II) nitrate into seven of the B wells -place 2 drops of iron (III) nitrate into seven of the C wells -place 2 drops of the barium nitrate into seven of the D wells -place 2 drops of nickel (II) nitrate into seven of the E wells -The next drops go in the numbered columns -place 2 drops of sodium phosphate into five vertical wells under 1 -place 2 drops of sodium iodide into five vertical wells under 2 -place 2 drops of sodium sulfate into five vertical wells under 3 -place 2 drops of sodium chloride into five vertical wells under 4 -place 2 drops of sodium bicarbonate into five vertical wells under 5 -place 2 drops of sodium carbonate into five vertical wells under 6 -place 2 drops of sodium hydroxide into five vertical wells under 7 -After I was done with the exercise, I cleaned up and put away my LabPaq. Observations and Results le | Negative Ions (Anions) | Positive Ions (Cations) | Solubility of Compounds | All negative ions are _____ with | Alkali ions | Soluble | All negative ions are _____ with | Hydrogen | Soluble | All negative ions are ______ with | Ammonium Ions | Soluble | Nitrate NO3 - ions are _________ with | All positive ions | soluble | Acetate CH3COO- ions are ______ with | All positive ions | soluble | Chloride, Cl- Bromide Br- Iodide I- | AG+, PB ^2-, HG2^2+, CU+All other positive ions are | Insolublesoluble | Sulfate SO4 2- |
Question: A. How did your proposed Procedures or flow charts at the beginning of this experiment compare to the actual Procedures of this lab exercise? My flow chart was very close to the actual lab . The only step that I did not include was letting the water evaporate for the table salt. I suppose I was thinking that it would be estimated by process of elimination.
Experiment Mu: Intermolecular Forces Introduction The experiment introduced techniques using capacitance meter, refractive index and specialist software (Mathcad) to study the concepts of dipole moments, bond moments, Leonard-Jones (6-12) potential, polarisation and dielectric constant. Part A: Experimental Determination of Dipole Moments in Solution. The aim of the first part of the experiment was to determine the dipole moment of the polar substituted benzene compounds (chlorobenzene, 1,2- dichlorobenzene and 1,3-dichlorobenzene) by measuring the dielectric constant and refractive indices of dilute solutions of the compounds in a non-polar solvent (cyclohexane) and relating the measured dipole moment to geometry and electronic environment of the molecule in consideration. Part B: Intermolecular Forces using Mathcad. The aim of the second part of the experiment was to use the Mathcad software to understand the Lennard-Jones potential and to determine the dipole moment of CH2Cl2 and plot a potential energy curve for this compound.