Lab procedure, chemistry homework help

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Description

Experiment 7: Gas Law Goals 1. Students will understand the ideal gas law

2. Students will understand partial pressure 3. Students will understand limiting reagents

Objectives:

1. Students will be able to determine the identity of an unknown metal

2. Students will be able to use a gas collection tube

3. Students will be able to safely handle chemicals

4. Students will be able to do limiting reagent stoichiometry calculations

Introduction :

In this experiment you will be determining the identity of an unknown metal by determining the atomic mass and comparing your experimental results with the expected value. Obtaining accurate results will require taking a number of corrections into account.

Equipment:

1. Barometer (on the front wall)

2. Gas measuring tube (x8)

3. Buret Stand (x4)

4. Scissors

5. Thermometer, 0.1o C (x4)

6. 2-hole rubber stopper, #0 (x8)

7. Bucket

8. Universal pH paper

*Reagents:

1. Metal ribbon

2. Steel wool

3. 12 M HCl

4. Copper wire

5. Sodium bicarbonate

Resources:

1. http://science.widener.edu/svb/video/

2. CRC Handbook of Chemistry and Physics - You may use any edition

3. NIOSH Pocket Guide to Chemical Hazards (NPG) - http://www.cdc.gov/niosh/npg/

4. SIRI MSDS Database - http://siri.org/msds/index.php

5. NIST Fundamental Constants - http://physics.nist.gov/cuu/

6. Comprehensive Guide to Chemical Resistant Best Gloves - http://www.chemrest.com/ Widener University Chem 147 Page 46 5/18/2017

7. 12 Principles of Green Chemistry – http://bit.ly/1zV7h5c

8. Wikipedia – Eudiometer - http://en.wikipedia.org/wiki/Eudiometer

Procedure

1. Safety. Prior to working in the lab, you need to research physical properties, health and safety information for copper, water, hydrochloric acid and hydrogen. Check the material data safety sheet (MSDS), the NIOSH “Pocket Guide to Chemical Hazards” and “International Chemical Safety Cards”. Find the following information and give references: (a. CAS number b. Relevant physical properties c. NFPA code and meaning d. Necessary precautions)

2. Determination of atomic mass. Develop a procedure for determining the atomic mass. You can start with a piece of metal ribbon. If you add this to concentrated hydrochloric acid the ribbon will react and produce hydrogen gas. Details that you need to account for include:

a. Write the balanced chemical equation with phase designations for the reaction of the metal with hydrochloric acid. The metal will have a charge of +1, +2, +3, or +4.

b. How can you determine that the reaction has gone to completion?

c. Most metals react with oxygen in the air to produce oxides. What problem could this cause? How can you fix or avoid this problem?

d. Use 5-10 mL of HCl. It is important that the metal is the limiting reagent, how will you know if all the metal has reacted? For your first trial, start with 0.05 g of metal and adjust the mass accordingly based on the volume of gas produced.

e. Determine the vapor pressure of water for the conditions of this experiment. Prepare a graph of vapor pressure vs temperature for water. What information do you need to record during the experiment to use this graph to determine the vapor pressure of water?

f. How does the difference between the level of the water inside the gas collection tube and the level of water outside the gas collection tube affect the volume reading? What can you do to fix or avoid this problem and obtain the correct volume of gas?

g. Technique is important to getting good results. How many trials are you going to perform to get good experimental results?

h. The waste will be very acidic and contain excess HCl. How can you neutralize this prior to disposal? What does your experimental procedure need to include to address Green principal #1, Prevention?

3. Your procedure should include step-by-step detail for the following:

a. A balanced chemical equation with phase designations.

b. A consideration of all questions listed above for the determination of R.

c. Detail on what substances you use, the quantities you use and how you measure them, what glassware you use, etc.

d. A graph of vapor pressure vs temperature for water.

e. Numbered references for all external information you use.

f. Safety and waste disposal information.

g. Detail should be sufficient for another student to reproduce your experiment using nothing but your procedure.

Notes:

1- It must have all the steps.

2- All data should be recorded.

3- I will upload my previous procedure from exp.6 to show you how I need the work to be like!

Unformatted Attachment Preview

Procedure Guide for Gas Law Experiment Note: Fill in yellow area on tables, remove all grey text. Lab Section: Name e-mail Role Safety Compound CAS # Relevant Physical Properties NFPA code and meaning Copper HCl (12.0 M) Hydrogen Water Necessary precautions (i.e., labcoat, goggles, gloves, hood, etc.) Substance Requiring Precaution Reason for Precaution Procedure 1. Write the balanced chemical reaction 2. Step 1 3. Step 2, etc. Make sure you have addressed the following questions in your procedure: 1. How can you determine that the reaction has gone to completion? 2. Most metals react with oxygen in the air to produce oxides. What problem could this cause? How can you fix or avoid this problem? 3. Use 5-10 mL of HCl. It is important that the metal is the limiting reagent, how will you know if all the metal has reacted? 4. The vapor pressure of water in torr is a function of temperature in Celsius that fits the following equation1: 1 M. Duffy, 2015 from CRC Handbook of Chemistry and Physics 83th edition, 2002 5. 6. 7. 8. Vapor Pressure = 0.0327 T2 - 0.1809 T + 8.0007 What information do you need to determine the vapor pressure of water? How does the difference between the level of the water inside the gas collection tube and the level of water outside the gas collection tube affect the volume reading? What can you do to fix or avoid this problem and obtain the correct volume of gas? Technique is important to getting good experimental results. How many trials are you going to perform? The waste will be very acidic and contain excess HCl. How can you neutralize this prior to disposal? What does your experimental procedure need to include to address Green principal #1, Prevention? References Procedure Guide for Solutions - Concentration Experiment Note: Fill in yellow area on tables, remove all grey text. Lab Section: Name Marcos Matthew Nora e-mail Role Team manager Recorder Calculator Safety Common Name Chemical Name Chemical Formula Molecular Weight CAS # Solubility information Salt Sodium chloride NaCl 58.44 g/mol 764714-5 solubility is 359 grams. Soluble in Water Acid Yellow 23 Tartrazine C16H9N4Na3O9S2 534.3 g/mol 193421-0 Solubility is 140 g/l. Soluble in water Necessary precautions (i.e., labcoat, goggles, gloves, hood, etc.) Lab Coat goggles Substance Requiring Precaution Required Required Reason for Precaution Protect the skin Protect the eyes Procedure 1) 2) 3) 4) 5) 6) 7) Weight out 21.915g NaCl Place NaCl in 100 ml volumetric flask Add 25 ml of water to the volumetric flask Wait until the NaCl dissolves Evaporate 10.0 mL from 0.15 M NaCl solution Prepare 100.0 mL of 1.0 x 10-3 Acid Yellow 23 (Tartrazine) Use the stock solution to prepare 100.0 mL of 1.0 x 10-5 Acid Yellow 5, Tartrazine 8) Determine the absorbance for each of the individual dye solution (1 replicate each). 1. Waste - What does your experimental procedure need to include to address Green principal #1, Prevention? References 1) https://en.wikipedia.org/wiki/Sodium_chloride 2) http://www.sigmaaldrich.com/catalog/search?term=7647-145&interface=CAS%20No.&N=0+&mode=partialmax&lang=en®ion=US&foc us=product 3) https://en.wikipedia.org/wiki/Tartrazine 4) https://www.scbt.com/scbt/product/tartrazine-1934-21-0 5) https://www.vinayakcorporation.com/tarmsdc.htm 6) http://archive.iorodeo.com/content/colorimetry-tartrazine-yellow-dye-5
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Explanation & Answer

Attached.

Procedure Guide for Gas Law Experiment
Note: Fill in yellow area on tables, remove all grey text.
Lab Section:
Name
Marcos
Matthew
Nora

e-mail

Role
Team manager
Recorder
Calculator

Safety
Compound

CAS #

Copper

7440-50-8

HCl (12.0 M)

7647-01-0

Hydrogen

1333-74-0

Water

7732-18-5

Necessary precautions
(i.e., labcoat, goggles,
gloves, hood, etc.)
Labcoat
Goggles
Gloves
Gas mask

Relevant
Physical Properties
Has a covalence of 1 or 2
Good conductor of heat
and electricity
It is colorless with
pungent odor

At standard pressure and
temperature, it is
nontoxic, odorless,
tasteless, colorless, and
highly combustible
diatomic gas.
It is colorless, odorless

Substance
Requiring
Precaution
Required
Required
Required
Required

Procedure
1. Write the balanced chemical reaction

NFPA code and meaning
NFPA 70: The national
Electrical Code
NFPA 704: Standard system
for the identification of the
hazards of materials for
emergency response
NFPA 50A: Standard for
gaseous hydrogen systems at
consumer sites.

NFPA 14: Standard for the
installation of standpipe and
h...


Anonymous
Just what I was looking for! Super helpful.

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