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Materials list

100 mls volumetric flask

3M hydrochloric acid (HCl) solution

sodium bicarbonate NaHCO 3 size 12{ left ("NaHCO" rSub { size 8{3} } right )} {}

methyl orange indicator

Part 2

  • Ask you TA for your assigned molarity–it will range from 0.7 M to 1.2 M.
  • First need to know the formula for the solute.
  • Need the molecular weight of the solute in g/mole.
  • The volume of solution, 100 mLs.
  • Remember to ensure that all the solute is dissolved before finally filling with deionised water to the mark on the volumetric flask.
  • Take your solution to your TA to check the molarity by titration, record value on your report form and your percent error.

Pre-lab 2: stoichiometry

(Total 10 points)

Click here to print the Pre-Lab Note: In preparing this Pre-Lab you are free to use references and consult with others. However, you may not copy from other students’work (including your laboratory partner) or misrepresent your own data (see honor code).

Name(Print then sign): ___________________________________________________

Lab Day: ___________________Section: ________TA__________________________

Circle the correct answer:

1) Which one of the following is a correct expression for molarity?

A) mol solute/L solvent

B) mol solute/mL solvent

C) mmol solute/mL solution

D) mol solute/kg solvent

E)μmol solute/L solution

2) What is the concentration (M) of KCl in a solution made by mixing 25.0 mL of 0.100 M KCl with 50.0 mL of 0.100 M KCl?

A) 0.100

B) 0.0500

C) 0.0333

D) 0.0250

E) 125

3) How many grams of CH 3 OH size 12{"CH" rSub { size 8{3} } "OH"} {} must be added to water to prepare 150 mL of a solution that is 2.0 M CH 3 OH size 12{"CH" rSub { size 8{3} } "OH"} {} ?

A) 9.6× 10 3 size 12{"10" rSup { size 8{3} } } {}

B) 4.3× 10 2 size 12{"10" rSup { size 8{2} } } {}

C) 2.4

D) 9.6

E) 4.3

4) The concentration of species in 500 mL of a 2.104 M solution of sodium sulfate is __________ M sodium ion and __________ M sulfate ion.

A) 2.104, 1.052

B) 2.104, 2.104

C) 2.104, 4.208

D) 1.052, 1.052

E) 4.208, 2.104

5) Oxalic acid is a diprotic acid. Calculate the percent of oxalic acid H 2 C 2 O 4 size 12{H rSub { size 8{2} } C rSub { size 8{2} } O rSub { size 8{4} } } {} in a solid given that a 0.7984 g sample of that solid required 37.98 mL of 0.2283 M NaOH for neutralization.

A) 48.89

B) 97.78

C) 28.59

D) 1.086

E) 22.83

6) A 31.5 mL aliquot of H 2 SO 4 size 12{H rSub { size 8{2} } "SO" rSub { size 8{4} } } {} (aq) of unknown concentration was titrated with 0.0134 M NaOH (aq). It took 23.9 mL of the base to reach the endpoint of the titration. The concentration (M) of the acid was __________.

A) 0.0102

B) 0.0051

C) 0.0204

D) 0.102

E) 0.227

7) What are the respective concentrations (M) of Fe 3 + size 12{"Fe" rSup { size 8{3+{}} } } {} and I size 12{I rSup { size 8{ - {}} } } {} afforded by dissolving 0.200 mol FeI 3 size 12{"FeI" rSub { size 8{3} } } {} in water and diluting to 725 mL?

A) 0.276 and 0.828

B) 0.828 and 0.276

C) 0.276 and 0.276

D) 0.145 and 0.435

E) 0.145 and 0.0483

8) A 36.3 mL aliquot of 0.0529 M H 2 SO 4 size 12{H rSub { size 8{2} } "SO" rSub { size 8{4} } } {} (aq) is to be titrated with 0.0411 M NaOH (aq). What volume (mL) of base will it take to reach the equivalence point?

A) 93.6

B) 46.8

C) 187

D) 1.92

E) 3.84

9) A 13.8 mL aliquot of 0.176 M H 3 PO 4 size 12{H rSub { size 8{3} } "PO" rSub { size 8{4} } } {} (aq) is to be titrated with 0.110 M NaOH (aq). What volume (mL) of base will it take to reach the equivalence point?

A) 7.29

B) 22.1

C) 199

D) 66.2

E) 20.9

10) A solution is prepared by adding 1.60 g of solid NaCl to 50.0 mL of 0.100 M CaCl 2 size 12{"CaCl" rSub { size 8{2} } } {} . What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution is 50.0 mL.

A) 0.747

B) 0.647

C) 0.132

D) 0.232

E) 0.547

Report 2: stoichiometry

(Total 80 points)

Note: In preparing this report you are free to use references and consult with others. However, you may not copy from other students’work (including your laboratory partner) or misrepresent your own data (see honor code). This is only an advisory template of what needs to be include in your complete lab write-up.

Name(Print then sign): ___________________________________________________

Lab Day: ___________________Section: ________TA__________________________

Part 1

Data table

Mass Grams
empty 150-mL beaker
NaHCO 3 in beaker size 12{"NaHCO" rSub { size 8{3} } " in beaker"} {}
Mass of NaHCO 3 size 12{"Mass of NaHCO" rSub { size 8{3} } } {}
Mass Grams
NaCl plus beaker first weighing
NaCl plus beaker second weighing
NaCl plus beaker third weighing

1) The grams of NaHCO 3 size 12{"NaHCO" rSub { size 8{3} } } {} you had in your beaker was ________

2) Calculate how many moles of NaHCO 3 size 12{"NaHCO" rSub { size 8{3} } } {} the mass is ________

3) Write the molar ratio for the NaHCO 3 size 12{"NaHCO" rSub { size 8{3} } } {} / NaCl ratio _______

4) Write the number of moles of NaCl you predict were produced in your experiment.

5) Calculate the mass of NaCl you predict will be produced.

6) Determine, by subtraction, the actual mass of NaCl produced in your experiment.

a) first weighing

b) second weighing

c) third weighing

7) Calculate your percentage yield.

Discussion questions

1. Compare the numerical value of the observed ratio for maximum yield to the best ratio

Part 2

Record your TAs value of the molarity of your solution.

Calculate your percent error from your assigned value.

Complete the equation for the titration of

NaHCO 3 aq + HCl aq size 12{"NaHCO" rSub { size 8{3 left ("aq" right )} } +"HCl" rSub { size 8{ left ("aq" right )} } rightarrow } {}

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
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Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
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Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
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Adin
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Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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absolutely yes
Daniel
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it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
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Source:  OpenStax, Honors chemistry lab fall. OpenStax CNX. Nov 15, 2007 Download for free at http://cnx.org/content/col10456/1.16
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