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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

are nano particles real
Missy Reply
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
has a lot of application modern world
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
Nasa has use it in the 60's, copper as water purification in the moon travel.
nanocopper obvius
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
analytical skills graphene is prepared to kill any type viruses .
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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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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