New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

14BL week 2 Notes

by: Daniel Ochs

14BL week 2 Notes CHEM 14BL

Daniel Ochs

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Lecture 2 of Week 2 Notes
General and Organic Chemistry Laboratory I
Class Notes
25 ?




Popular in General and Organic Chemistry Laboratory I

Popular in Chemistry and Biochemistry

This 10 page Class Notes was uploaded by Daniel Ochs on Monday April 11, 2016. The Class Notes belongs to CHEM 14BL at University of California - Los Angeles taught by Casey in Spring 2016. Since its upload, it has received 22 views. For similar materials see General and Organic Chemistry Laboratory I in Chemistry and Biochemistry at University of California - Los Angeles.

Similar to CHEM 14BL at UCLA

Popular in Chemistry and Biochemistry


Reviews for 14BL week 2 Notes


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 04/11/16
Lecture 2 4/6/16 Volumetric Glassware • Volumetric means report to hundreth decimal place • 5-mL volumetirc pipet: 5.00 mL • 25-mL volumetric buret: 25.00 mL • 100-mL volumetric flask: 100.00 mL • Acceptable range for a 10-mL volumetric pipet • 9.96 to 10.04 Analyzing Real Samples • Various Methods to choose from • Method choice depends on what we want the precision to be 1- Gravimetric Analysis • “Weight Relations” • Very precise quantitaitve technique • Precision— quantitative analysis (+/- 0.1%) • Disadvantages • Difficult: must be able to selecitvely isolate the component to be measured as a solid compoind • Time Consuming • Expensive 2- Volumetric Analysis • Precision— quantitative analysis (+/- 0.5%) • Disadvantages • Time Consuming (though faster than gravimetric analysis) • Expensive 3- Spectrophotmetric Analysis • Beer’s Law • Precision— semi-quantitative (+/- 5 to 10%) • Advantages • Rapid • Easy to establish quality control meausres for reliability • Lends itself to on-line monitroring • Disadvantages • Have to set up chemistry so that the absorbtion of light by chemical species of interest will have a very different absorbtion profile than the other constituents in the solution • See Theory on Beer’s Law in Handout Fundamental Law of Spectrophotometry • For dilute solutions, the following relation between the intensity of incident light (Io) and the transmitted light (I) holds: I/Io = 10^(-eLC) • Io= intensity of incident light beam • I= intensity of transmitted light beam • e= Molar absorpitivity constant (unit in L/mol cm) • Depends on the indentity of the chemical species and the wavelength selected • C= Concentration (mol/L) of the chemical species • L= Depth of the solution (cm) trnasversed by the light Transmittance, Absrobance, and Concentration • Transmittance: T = I/Io [ranges from 0 to 1] • I/Io = 10^(-eLC) = T • Absorbance: A = -logT • Beer’s Law: A = eLC • e and C are related to the chemical species being analyzed • A is directly proportional to C Beer’s Law: A = eLC • A is detemined in the labratory during the experiement • Falls in range between 0.1 to 1.0 • C is the unknown quantity • e is a physical characteristic of the chemical species being measured • e depends on wavelength • Only a constant if and only if: • Wavelength must be fixed during analysis • Sample has a low (ambigous) concentration • L is a Constant • See Graphical Representations of Beer’s Law Graphs in handout Two Major Problems in Beer’s Law • Beer’s Law doesn’t work if the concentration of the solution is too high (A is greater than 1.0) • Solution: dilute the sample • Need to take care of background interference • Solution: use a blank solution • Blank solution: contains ALL the chemical species except for the one you want to measure • Example of blank solution in Handout


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Anthony Lee UC Santa Barbara

"I bought an awesome study guide, which helped me get an A in my Math 34B class this quarter!"

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

Parker Thompson 500 Startups

"It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.