% error when using colour indicator instead of pH meter.
Working range of phenolphthalein is pH 8.0 to 9.8.
For the HCl (strong acid), the titration end point is pH 7.0. To determine % error you should
% error = [pH (titration end point) avg
Acid Base Titration Lab Exam
Note that this information can not be brought into the lab exam. You may, however, bring
your lab notebook with any handwritten material into the exam.
The purpose of the lab exam is to have you demonstrate that you can perfor
AB titration calculation tips
Actual concentration of acids
For HCl (strong base strong acid). Any strong base strong - acid titration will have an
equivalence point at pH 7.
If it took 20.00mL NaOH to titrate the HCl to pH 7 then:
You can use C1V1 =
Acid Base Titration Curves
Use acid-base titration to determine
a strong acid HCl
a weak acid CH3COOH
Practice (for lab exam) using:
pH indicators (same as lab exam)
Equipments and Reagents
In excel set up your data (obtained during the lab) as seen:
To save time enter 82.03 once and copy and paste into the other cells
To calculate moles:
To calculate M:
In cell F4 type: =(
In cell H4 type: =(
then click on cell D4
The lab exam sheet is in your manual (p.1). You MUST
bring it with you.
You will be allowed your notebook and the exam sheet
It is strongly, STRONGLY recommended that you look
at the lab exam calculations posted in CuLearn and
work out the calculati
Practice lab exam questions, CHML 235, Fall 2006 1. In the first part of a laboratory experiment, the 0-50.00 mL portion of a 50.00 mL buret was calibrated. The results for three trials are shown below.
Buret Tem reading (ml) p. ("apparent (C) volume") St
p. 41 will give you the uncertainty for EVERY piece of equipment you will use.
Remember that when you are dealing with values such as volumes, masses
and measurements, the significant figure rule is slightly different.
The Use of a Practical Titration Exercise to Assess
Student Learning in the General
Katherine A. Bichler
Associate Professor of Chemistry
University of Wisconsin Colleges
First, Who are the UW Colleges?
campuses throughout the sta
These sheets cannot be taken into the lab exam
PRACTICAL CHEM 1101 LAB EXAM
1) The lab exam is 75 min, do not discuss with other students this will result in
removal of exam sheet. Show all the calculations on the Exam Sheet. Almost 50
Check the group list. If you are groups A to D you will begin labs the week of
September 9th and will attend EVERY SECOND WEEK. Groups E to H begin the
week of September 16th and also attend EVERY SECOND WEEK. Page 1 of your
How to go about writing your short report:
1 - Think about WHAT is being taught to you. In this case, it is thermodynamics and heats of
2 - Think about WHAT equations were emphasized during the lab talk. In this case,