Problem Set 1 Solutions

Problem Set 1 Solutions - C hemistry 2101 I ntroductory...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry 2101 Introductory Analytical Chemistry Solutions Problem Set 1 Chapter 3 Problem 3-1 1.237, 1.238, 0.135, 2.1, 2.00 Remember: Round a 5 to the nearest even digit. Thus 2.005 is rounded to 2.00 but 2.015 is rounded to 2.02. This avoids a systematic error upon repeated rounding off. Problem 3-4 12.3, 75.5, 5.520 10E3, 3.04, 3.04 10E-10, 11.9, 4.600, 4.9 10E-7 Problem 3-8 Because all measurements have an uncertainty, there is no way to know the true value. Problem 3-9 (a) Systematic error arises from a procedure or an instrument that gives inaccurate results. The error is always in the same direction (positive or negative) if you repeat the same measurements. With care, systematic error can be detected and corrected. Random error arises from physical limitations in making measurements. It is sometimes negative and sometimes positive when repeating the same measurement. (b) The pipet always delivers 0.031 mL more than it is rated for. This is a systematic error. The 0.009 mL is the random error in the volume delivered.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/06/2011 for the course CHEM 2011 taught by Professor Buhlman during the Spring '10 term at Minnesota.

Page1 / 2

Problem Set 1 Solutions - C hemistry 2101 I ntroductory...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online