Lesson 1_ Laboratory Equipment Safety pdf.pdf

Lesson 1 Laboratory Equipment

1. Welcome
to
World University Of Bangladesh
Department of Civil Engineering
Course title:
Chemistry Lab: Inorganic Quantitative Analysis
Course Code: CHEM 106
Presented by
Dr. Jahida Binte Islam
Senior Lecturer in Chemistry
Basic Science Division

2. Topics:LaboratoryEquipmentandsafety
❑Discuss about laboratory equipment
❑How to use this equipment
❑Precautions before using chemicals in lab

3. Laboratory Equipment
LaboratoryEquipment:Thelaboratoryequipmentisthetypeofequipment
foundinabuildingorroomequippedforconductingscientificresearchorfor
teachingpracticalscience,asforcarryingoutscientificexperiments,etc.

4. Work ethics for a chemistry Laboratory
As any other endeavor in science, working in chemical laboratory also requires following
certain work ethics.
➢Never work in a laboratory without proper supervision.
➢Use laboratory coat and apron while working in the laboratory.
➢Always handle the chemicals carefully.
➢Do not carry the reagent bottles to your work place.
➢If poisonous gases are evolved in your experiment, make sure that the experiment is carried
out with proper exhausted system.

5. •Placeallwastepapers,usedmatches,brokenglassesandothermaterialinthewaste
basket.
•Acids,basesandotherliquidsmustbedraineddownthesinkwithwater.
•Avoidusinganexcessofreagent.
•Ifcorrosivechemicalsorliquidscomeincontactwiththeskinorclothing,floodwith
copiousamountsofwaterforanextendedperiodoftime.
•Beforeleavingthelaboratorymakessureyoucleanyourworkplaceandotherpointsof
thelaboratorywhereyouhavecarriedoutsomeoperationliketransferring,weighingetc.

6. Precautions before using apparatus
•Theburettemustbecleanedwithdistilledwatercarefully,thenitisrinsedwithsolution.
•Inthesamewaythepipettemustbealsowashedwithdistilledwaterbeforeusing.
•Thepipetteshouldbekeptonacleansheetofpaper.
•Thekeyofburetteisopenedcarefullytomakesurethatonedropofacidfallsintothe
conicalflaskatatime.
•Theconicalflaskiskeptonawhitepapertotracethecolorchangeofthe
solution.

7. •Atfirstthekeyofburetteisfullyopenedtoletthesolutionfallfreetomake
thebubblesgoout.
•Whilemeasuringthelowermeniscusoftheburetteanerrormaybe
occurredfortheparallaxerror.Soconcentrationshouldbeneededhere.

8. Analytical Chemistry
Analytical chemistry is a quantitative science. It is defined as the study of the separation,
identifications and quantification of the chemical components of natural and artificial materials.
Analytical chemistry divided into two areas-
1.Qualitative analysis
2.Quantitative analysis
❖Qualitative analysis:It deals with the identification of substances. I mean it is concerned with
what elements or compounds are present in the sample.

9. ❖Quantitative analysis:It is concerned with the determinations of how much of a particular
substance is present in a sample.
❑Titrimetric Analysis:
Titrimetric analysis is a large and powerful group of quantitative procedures based on measuring
the amount of reagent of known concentration that is consumed by an analyte.
NaOH + HCl= NaCl + H
2O

10. Fig: Titrimetric analysis

11. ❖Titration:Titration is a common laboratory method of quantitative chemical analysis that is
used to determine the unknown concentration of a known reactant.
❖Titrant: The reagent of a known concentration is called the titrant.
❖Analyte: Analyte is solution whose concentration is not known.
❖Endpoint: The endpoint is the point at which the titration is complete, as determine by an
indicator.
❖Indicator:Indicator is a substance used in titrations to indicate the completion of a chemical
reaction, usually by change of color.