Cambridge International Examinations
Cambridge International Advanced Subsidiary and Advanced Level
*7278217255*
CHEMISTRY 9701/34
Paper 3 Advanced Practical Skills 2 October/November 2014
2 hours
Candidates answer on the Question Paper.
Additional Materials: As listed in the Confidential Instructions
READ THESE INSTRUCTIONS FIRST
bestexamhelp.com
Write your Centre number, candidate number and name on all the work you hand in.
Give details of the practical session and laboratory where appropriate, in the boxes provided.
Write in dark blue or black pen.
You may use an HB pencil for any diagrams or graphs.
Do not use staples, paper clips, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.
Answer all questions.
Electronic calculators may be used.
You may lose marks if you do not show your working or if you do not use appropriate units.
Use of a Data Booklet is unnecessary.
Session
Qualitative Analysis Notes are printed on pages 10 and 11.
At the end of the examination, fasten all your work securely together.
Laboratory
The number of marks is given in brackets [ ] at the end of each question or
part question.
For Examiner’s Use
1
2
3
Total
This document consists of 11 printed pages and 1 blank page.
IB14 11_9701_34/3RP
© UCLES 2014 [Turn over
, 2
1 Hydrogen peroxide, H2O2, is used in hair bleach and for skin therapies. In this experiment you will
determine the concentration of a solution of hydrogen peroxide by titration with acidified potassium
manganate(VII).
FB 1 is 0.0250 mol dm–3 potassium manganate(VII), KMnO4.
FB 2 is dilute sulfuric acid, H2SO4.
FB 3 is aqueous hydrogen peroxide, H2O2.
(a) Method
Dilution of FB 3
● Pipette 25.0 cm3 of FB 3 into the volumetric (graduated) flask.
● Make the solution up to the mark using distilled water.
● Shake the flask thoroughly.
● This diluted solution of hydrogen peroxide is FB 4.
Titration
● Fill the burette with FB 1.
● Pipette 10.0 cm3 of FB 4 into a conical flask.
● Use a measuring cylinder to add 25 cm3 of FB 2 into the same flask.
● Add FB 1 until a permanent pale pink colour is seen.
● Perform a rough titration and record your burette readings in the space below.
The rough titre is ................ cm3.
● Carry out as many accurate titrations as you think necessary to obtain consistent results.
● Make sure any recorded results show the precision of your practical work.
● Record in a suitable form below all of your burette readings and the volume of FB 1 added
in each accurate titration.
Keep solution FB 2 for use in Question 3 and solution FB 3 for use in Questions 2 and 3.
I
II
III
IV
V
VI
VII
[7]
© UCLES 2014 9701/34/O/N/14
Cambridge International Advanced Subsidiary and Advanced Level
*7278217255*
CHEMISTRY 9701/34
Paper 3 Advanced Practical Skills 2 October/November 2014
2 hours
Candidates answer on the Question Paper.
Additional Materials: As listed in the Confidential Instructions
READ THESE INSTRUCTIONS FIRST
bestexamhelp.com
Write your Centre number, candidate number and name on all the work you hand in.
Give details of the practical session and laboratory where appropriate, in the boxes provided.
Write in dark blue or black pen.
You may use an HB pencil for any diagrams or graphs.
Do not use staples, paper clips, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.
Answer all questions.
Electronic calculators may be used.
You may lose marks if you do not show your working or if you do not use appropriate units.
Use of a Data Booklet is unnecessary.
Session
Qualitative Analysis Notes are printed on pages 10 and 11.
At the end of the examination, fasten all your work securely together.
Laboratory
The number of marks is given in brackets [ ] at the end of each question or
part question.
For Examiner’s Use
1
2
3
Total
This document consists of 11 printed pages and 1 blank page.
IB14 11_9701_34/3RP
© UCLES 2014 [Turn over
, 2
1 Hydrogen peroxide, H2O2, is used in hair bleach and for skin therapies. In this experiment you will
determine the concentration of a solution of hydrogen peroxide by titration with acidified potassium
manganate(VII).
FB 1 is 0.0250 mol dm–3 potassium manganate(VII), KMnO4.
FB 2 is dilute sulfuric acid, H2SO4.
FB 3 is aqueous hydrogen peroxide, H2O2.
(a) Method
Dilution of FB 3
● Pipette 25.0 cm3 of FB 3 into the volumetric (graduated) flask.
● Make the solution up to the mark using distilled water.
● Shake the flask thoroughly.
● This diluted solution of hydrogen peroxide is FB 4.
Titration
● Fill the burette with FB 1.
● Pipette 10.0 cm3 of FB 4 into a conical flask.
● Use a measuring cylinder to add 25 cm3 of FB 2 into the same flask.
● Add FB 1 until a permanent pale pink colour is seen.
● Perform a rough titration and record your burette readings in the space below.
The rough titre is ................ cm3.
● Carry out as many accurate titrations as you think necessary to obtain consistent results.
● Make sure any recorded results show the precision of your practical work.
● Record in a suitable form below all of your burette readings and the volume of FB 1 added
in each accurate titration.
Keep solution FB 2 for use in Question 3 and solution FB 3 for use in Questions 2 and 3.
I
II
III
IV
V
VI
VII
[7]
© UCLES 2014 9701/34/O/N/14
