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Analytical Chemistry Error Analysis

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it. In doing this it is crucial to understand that all measurements of physical quantities are subject to uncertainties. It is never possible to measure anything exactly. It is good, of course, to analytical chemistry and quantitative analysis hage free pdf make the error as small as possible but it is always there. And types of analysis in analytical chemistry in order to draw valid conclusions the error must be indicated and dealt with properly. Take the measurement of a person's qualitative analysis in analytical chemistry height as an example. Assuming that her height has been determined to be 5' 8", how accurate is our result? Well, the height of a person depends on how straight she stands, whether she just https://www.inorganicventures.com/accuracy-precision-mean-and-standard-deviation got up (most people are slightly taller when getting up from a long rest in horizontal position), whether she has her shoes on, and how long her hair is and how it is made up. These inaccuracies could all be called errors of definition. A quantity such as height is not exactly defined without specifying many other circumstances. Even if you could precisely specify the "circumstances," your result would still http://teacher.nsrl.rochester.edu/phy_labs/AppendixB/AppendixB.html have an error associated with it. The scale you are using is of limited accuracy; when you read the scale, you may have to estimate a fraction between the marks on the scale, etc. If the result of a measurement is to have meaning it cannot consist of the measured value alone. An indication of how accurate the result is must be included also. Indeed, typically more effort is required to determine the error or uncertainty in a measurement than to perform the measurement itself. Thus, the result of any physical measurement has two essential components: (1) A numerical value (in a specified system of units) giving the best estimate possible of the quantity measured, and (2) the degree of uncertainty associated with this estimated value. For example, a measurement of the width of a table would yield a result such as 95.3 +/- 0.1 cm. Significant Figures The significant figures of a (measured or calculated) quantity are the meaningful digits in it. There are conventions which you should learn and follow for how to express numbers so as to properly indicate their significant figures. Any digit that is not zero is significant. Thus 549 has three significant figures and 1.892 has four significant figures. Zeros b

Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our Privacy Policy and User Agreement http://www.slideshare.net/sureshselvaraj108/error-in-chemical-analysis for details. SlideShare Explore Search You Upload Login Signup Home Technology Education More Topics For Uploaders Get Started Tips & Tricks Tools Error in chemical analysis Upcoming SlideShare Loading in …5 × 1 1 of 26 Like this presentation? Why not share! Share Email Errors in chemical analyses byGrace de Jesus 2039views Errors in chemical analysis byUMAR ALI 993views Laboratory Errors bySathish Vemula 10904views LAB ERRORS byVikash Gautam 5193views Analytical chemistry lecture 3 bySunita analytical chemistry Jobli 342views Lecture 1&2 byArinah Alias 1410views Share SlideShare Facebook Twitter LinkedIn Google+ Email Email sent successfully! Embed Size (px) Start on Show related SlideShares at end WordPress Shortcode Link Error in chemical analysis 2,232 views Share Like Download Suresh Selvaraj, Assistant Professor at Aarupadai Veedu Institute of Technology, Chennai (Madras) Follow 0 0 0 Published on Apr 7, 2015 Mean, Median, Accuracy, Precision, Absolute error, Relative error, Significant Figures, Normal error analytical chemistry and curve ... Published in: Science 0 Comments 4 Likes Statistics Notes Full Name Comment goes here. 12 hours ago Delete Reply Spam Block Are you sure you want to Yes No Your message goes here Post Be the first to comment Madhu Sudhanachari , AQA chemist at Gland Pharma Limited 6 months ago ali mohammad , Senior Lecturer at The public authority for education and training (paaet) at The public authority of education and training (paaet) 8 months ago Siti A'bidah , Medical Officer at HOSPITAL KULIM 8 months ago Reem Mohammed , College student at Faculty of science SVU 9 months ago No Downloads Views Total views 2,232 On SlideShare 0 From Embeds 0 Number of Embeds 9 Actions Shares 0 Downloads 68 Comments 0 Likes 4 Embeds 0 No embeds No notes for slide Error in chemical analysis 1. ANALYTICAL CHEMISTRY (Error in Chemical Analysis) Dr.S.SURESH Assistant Professor Email:avitsureshindia@gmail.com 2. Mean value A mean value is obtained by dividing the sum of a set of replicate measurements by the number of individual results in the set. For example, if a titration is repeated four times and the titre values are 10.1, 9.9, 10.0 and 10.2ml Mean = 10.1 + 9.9 + 10 + 10.2 4 = 40.2 4 = 10.05 This mean value is also called arithmetic mean or average. 3. The media

 

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