(d) A student repeats the titration to determine the molar mass and structure of A. The student prepares a 250.0cm solution from 1.513g of A. The solution of A is added to the burette and titrated with 25.0cm3 volumes of 0.112moldm NaOH(aq). 1 mol of A reacts with 2 mol of NaOH. The student obtains a mean titre of 27.30 cm3. () Calculate the molar mass of A from these results. Give your answer to the nearest whole number. Show your working.
(d) A student repeats the titration to determine the molar mass and structure of A. The student prepares a 250.0cm solution from 1.513g of A. The solution of A is added to the burette and titrated with 25.0cm3 volumes of 0.112moldm NaOH(aq). 1 mol of A reacts with 2 mol of NaOH. The student obtains a mean titre of 27.30 cm3. () Calculate the molar mass of A from these results. Give your answer to the nearest whole number. Show your working.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Just D
![3.
(1) Record the student's readings and the titres in the table below.
Calculate the mean titre, to the nearest 0.05cm³, that the student should use for
analysing the results.
Titration 1
Titration 2
Titration 3
27.30
0145
乙デつ0 2元7S
Final reading/cm3
Initial reading/cm
0.60
26,40 26.5o
nearext o0S
,25
26.85
Titre/cm
2640 26So
cm³ [4]
mean titre =
(ii) The uncertainty in each burette reading is ± 0.05 cm3.
Calculate the percentage uncertainty for the titre in Titration 1.
incertainty in burette reatly
2x0.05 Y loos 0.37
26,85
percentage uncertainty =
.DZソ
% (1]
(i) The student realised that the solution of A had not been prepared correctly.
How should the student have made up the solution?
The studanduselans.ms of valumetes
flastinteadofebeaken
(1]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fec32660f-adcb-471d-81e1-1df99c2b1e69%2F3a375631-15dd-4bb6-a065-9c97b19d13c8%2Ftglfhyp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3.
(1) Record the student's readings and the titres in the table below.
Calculate the mean titre, to the nearest 0.05cm³, that the student should use for
analysing the results.
Titration 1
Titration 2
Titration 3
27.30
0145
乙デつ0 2元7S
Final reading/cm3
Initial reading/cm
0.60
26,40 26.5o
nearext o0S
,25
26.85
Titre/cm
2640 26So
cm³ [4]
mean titre =
(ii) The uncertainty in each burette reading is ± 0.05 cm3.
Calculate the percentage uncertainty for the titre in Titration 1.
incertainty in burette reatly
2x0.05 Y loos 0.37
26,85
percentage uncertainty =
.DZソ
% (1]
(i) The student realised that the solution of A had not been prepared correctly.
How should the student have made up the solution?
The studanduselans.ms of valumetes
flastinteadofebeaken
(1]
![(d) A student repeats the titration to determine the molar mass and structure of A.
The student prepares a 250.0cm³ solution from 1.513g of A.
The solution of A is added to the burette and titrated with 25.0 cm3 volumes of
0.112 moldm-3 NaOH(aq).
1 mol of A reacts with 2 mol of NaOH.
The student obtains a mean titre of 27.30 cm³.
(1) Calculate the molar mass of A from these results.
Give your answer to the nearest whole number.
Show your working.
molar mas
of A =
gmol' (4]
[AC 1.1]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fec32660f-adcb-471d-81e1-1df99c2b1e69%2F3a375631-15dd-4bb6-a065-9c97b19d13c8%2Fw2xvj88_processed.jpeg&w=3840&q=75)
Transcribed Image Text:(d) A student repeats the titration to determine the molar mass and structure of A.
The student prepares a 250.0cm³ solution from 1.513g of A.
The solution of A is added to the burette and titrated with 25.0 cm3 volumes of
0.112 moldm-3 NaOH(aq).
1 mol of A reacts with 2 mol of NaOH.
The student obtains a mean titre of 27.30 cm³.
(1) Calculate the molar mass of A from these results.
Give your answer to the nearest whole number.
Show your working.
molar mas
of A =
gmol' (4]
[AC 1.1]
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