Chemistry lab help needed

Anonymous
timer Asked: Apr 18th, 2017

Question Description

Hello i have attached the file at the bottom you can see the instructor comments. '

Point 2 regression line is already settled so just check point 1 and 3

Module 5 Lab Report – CHEM 1806 Anions, Cations, and Ionic Reactions Follow the directions in the lab write up. Record the requested data below to submit for your lab. Only report the information asked for. Do NOT add rows to the data tables. This lab is provided as a hands on way to test an unknown for the identity of cation and anion by using a flame test and a precipitation reaction. I just want to see the data and conclusions here. ☺ Data Table 1. Anion Confirmation Tests.(3pts) These are your observations. What happened? Chemical Anion Addition of AgNO3 Addition of HCl NaBr Bromide white and cloudy appeared Cloudy white Na2CO3 Carbonate inside clear cloudy from outside Little particles are gone and bubbles are added NaCl Chloride Clear to form white chalky color seen White color like chalk and particles are observed NaI Iodide Clear bubbles and white particles observed Cloudy white and yellow shade is observed Na2SO4 Sulfate Clear and remains clear in the solution Cloudy white observed Na2S Sulfide Clears and turn to brown particles No change occurred Unknown #103 (CO3)2Carbonate Clear and become cloudy white Cloudy seen Unknown #104 sulfide Clear to brown particles No change Data Table 2. Cation Flame Tests.(3pts) Chemical Cation Flame Observations KI Potassium Light pink flame is seen CaCl2 Calcium Red flame is seen LiOH Lithium Fusha pink is seen NaCl Sodium Orange flame is seen Cu(NO3)2 Copper Teal flame is seen Unknown #105 copper Teal flame is seen Unknown #106 potassium Light pink is seen Unknown #107 calcium Red flame is seen Data Table 3. Complete Chemical Identification. (6pts) Chemical Cation Anion Test Observations Anion Complete Chemical Name and Formula Unknown #105 copper With AgNO3 No change occurs CO3-2 Copper(II)nitrate, Cu(NO3)2 Unknown #106 potassium With AgNO3 in the middle very dark cloudy fades out lighter white in the middle observed I- Potassium iodide, KI Unknown #107 calcium Cl- Calcium chloride, CaCl2 With AgNO3 with turn white cloudy on the bottom to top observation Lab Techniques, Part 3 Follow the directions in the lab write up. Record the requested data below to submit for your lab. Only report the information asked for. Do NOT add rows to the data tables. This lab is practice for dilutions. This lab gives you experience using volumetric glassware and has you present your results in a meaningful way. You will need to obtain your regression line (aka: trendline or best fit line) and use the equation to determine the density of an unknown. Data Table 8. Initial Concentration.(2pts) Chemical Sugar (C12H22O11) Mass of Volumetric Flask 28.5 Mass of Sugar (g) Molar Mass (g) Moles in Volumetric Flask Total Volume (L) Molarity (mol/L) 8.0 342 0.023 0.025 0.920 Data Table 9. Dilution Series.(6pts) Dilution Volume (mL) Mass (g) Density (g/mL) 0 25.0 mL 24.9 0.996 1 25.0 mL 25.5 1.02 Initial Concentration (M) 0.92 Volume Transferred (mL) Final Concentration (M) 0 mL 0 2.5 mL 0.092 2 25.0 mL 25.9 1.036 0.92 3.0 mL 0.1104 3 25.0 mL 26.4 1.056 0.92 4.5 mL 0.1656 4 25.0 mL 27 1.08 0.92 6.0 mL 0.2208 Data Table 10. Molarity vs. Density.(6pts) Molarity vs. Density Molarity v/s Density y = 2.5395x - 2.5172 R² = 0.9804 0.25 Molarity 0.2 0.15 0.1 0.05 0 0.98 1 1.02 1.04 1.06 1.08 1.1 Density Additional Questions: 1. Report your regression line here. It should be in the form, molarity = slope * density + intercept. Keep in mind that you might need to remove an “outlier” from your data if most of your data forms a good line but there is one point that doesn’t seem to fit. Eliminate that point from the line equation so that your line is representative of your data. (1pts) 2. Dr. Pepper has 40.0g of sugar per 12 oz. of liquid. Calculate the molarity of this solution. Put that molarity into your regression line and calculate the density (all other things being equal) of this sugar solution. Show your work. (10pts)

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