LB 172L Study Guide - Nitric Acid, Reagent, Barium Chloride

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22 Dec 2014

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Document Summary

After doing this lab, you are expected to be able to: Write the chemical equations for the reactions observed in the laboratory. Describe and explain the different types of reactions observed. Explain how reaction of different elements and compounds can be used to identify the elements and compounds. Explain how color can be used to identify chemical moieties. Explain how the color of a mixture can interfere in identifying chemical components and how this can be mitigated. Learn how to test for cations and anions in a solution. Use the inorganic material tests to analyze a multi-vitamin. You will be working with concentrated acids and bases, naoh pellets, and other potentially harmful materials. Keep in mind that acids and bases of this strength can cause permanent damage (especially to eyes. ) You will also be using bunsen burners. In the past we have done a quantitative analysis where we found out how much of a substance is present in a sample.

Related Questions

In experiment five, the "Identification of Ions in Salts", youwill use a series of reactions to identify a cation in one unknownand a cation-anion in another unknown. In this experiment primarilyprecipitation reactions or dissolving of precipitates will be used.The color or texture of the precipitate will be important toobserve. In the identification of the anion the formation of a gaswill be used to help ID the anion and a flame test will be used toID the cation in the anion unknown. Be sure to wear goggles, usethe hood when required, dispose of waste properly, and never usecup sinks. You may also want to wear gloves for all or part of thisexperiment. Start by washing all glassware and rinsing with ROwater. Be sure to wash your glassware and rinse with distilledwater whenever you get a fresh sample of a cation solution and atthe end of the experiment. Please put the following experimentalsteps in the correct order for the identification of thecation.

In a hood observe while adding 1 mL concentrated ammonia to tubesthat formed precipitates with 1M ammonium hydroxide and mixwell.

Finally analyze your unknown using the same tests done for theknown cation solutions.

Test fresh 1 mL samples of cations that did not form precipitateswith 1 M HCl by observing while adding 5 drops of 1M ammoniumhydroxide and mix.

Add 0.5 mL of 0.1M sodium carbonate to fresh 1 mL samples ofcations that did not form precipitates with 1M HCl or 1M ammoniumhydroxide and mix.

Start by obtaining 1 mL samples of each cation solution, thenobserve while adding 0.5 mL of 1M HCl to each and mix.

In hood observe while adding concentrated ammonia to reactions thatformed precipitates with 1M HCl and mix well.

magentalouse806

Life Chemistry LabReport

Elements of Living Organisms
Name the five most abundant elements found in the humanbody.

Cells organize into tissues which work together to form

What is the difference between an atom and an element?

Molecules

Is glucose an atom or molecule? What are the atoms inglucose?

How many bonds can oxygen form?

Is C₆H₁₂O₆ a molecular orstructural formula? What is the name of this molecule?

Based on lab, Section II, draw and label a ball and stickrepresentation of a carbon dioxide, water and ethyl alcoholmolecule. Use circles to designate atoms and lines for bonds, thenindicate the chemical symbol for each atom. Sign, date and preparean image of your drawing and include it with this lab report.

Molecular Make Up of Living Organisms

Name the four groups of organic molecules.

_______ are the most abundant organic molecules in livingorganisms.

Name a polysaccharide, monosaccharide, protein and alipid.

Go to the lab, Section 3, Exercises 2, 3, 4 and 5 to completethe following table:

Type of Organic Molecule	Reagent	Sample Tested	Positive Color	Negative Color
Carbohydrate (starch)	Iodine
Sugar	Benedictâs solution
Lipid (fat)	Sudan IV
Protein	Biuret

Go to the lab, Section 3, Exercise 6 to locate starch in potatocells. Describe the microscopic appearance of starch in terms ofcolor and location within the cells.

Measurement of pH

What substance has an equal number of hydrogen ions(H⁺) and hydroxide ions (OH^-)?

What is the pH of the above substance?

How does the addition of hydroxide ions (OH^-) affectthe pH of your stomach?

Go to lab, Section 4, Exercise 7 to test the pH of commonsolutions. Which solution tested had a pH closest to neutral? Whichsolution was most acidic?

Summary Questions

What is the smallest subunit of carbohydrates?

Which reagent could be used to test for diabetes?

A member of your family has a high blood cholesterol count. Yousee âfat freeâ crackers in the grocery store and decide to test theproduct for the presence of lipids. How would this testproceed?