Volumetric Analysis

Question 1

Quantative

Answer 1

Find the amount of something

Question 2

Qualilitve

Answer 2

Identify the presence of a particular substance

Question 3

Solution

Answer 3

Completely perfect mixture of a solute and solvent
In a solution the solute particles are uniformly distributed throughout the solvent, solution is Homogeneous

Question 4

Concentration

Answer 4

The amount of solute dissolved in a given volume of solvent

Question 5

%w/w

Answer 5

G/100g
Divide both sides by no of grams of solution then x100

Question 6

%w/v

Answer 6

G/100cm3
Divide both sides by the no of cm3 then x 100

Question 7

%v/v

Answer 7

Cm3/100cm3
Divide both sides by total no of cm3 then x100

Question 8

PPM

Answer 8

1ppm= 1mg/L
Divide by no of cm3 then x1000

Question 9

Molarity

Answer 9

No of moles of solute per L of solution ie Mol/L

Question 10

g/L

Answer 10

Mol/L x RMM

Question 11

Standard solution

Answer 11

Solution whose concentration is accurately known

Question 12

Primary standard

Answer 12

Substance that can be obtained in a stable pure and soluable solid
So that it can be weighed out and dissolved in water to give a solution of accurately known concentration

Question 13

Give an example of a primary standard

Answer 13

Anhydrous Sodium carbonate

Question 14

What are the criteria of a primary standard

Answer 14

Must be in a highly pure state
Must be stable in air
Must dissolve easily in water
High molecular mass
Rapid and complete reaction
Anhydrous

Question 15

What is the primary standard used in acid base titration

Answer 15

Anhydrous sodium carbonate

Question 16

What is a standardised solution

Answer 16

Obtained its concentration from titrations

Question 17

Titration

Answer 17

An experiment where the measured volume of 1 solution is added to the known volume of another solution until the reaction is complete

Question 18

What is a volumetric flask used for

Answer 18

Make up standard solutions

Question 19

How do you fill a pipette

Answer 19

Using a pipette filler

Question 20

Why is a pipette filler used

Answer 20

Safety

Question 21

Where does the acid go

Answer 21

Burette

Question 22

How to fill a pipette

Answer 22

Rinse with deionised water
Rinse pipette with what you are filling it with
Fill pipette using pipette filler until the bottom of the meniscus rests on the mark when measured at eye level
Place end of pipette into conical flask and drain
Wait 5 seconds and touched tip against the side of the conical flask
Do not blow out the last drop

Question 23

Why do you not blow out the last drop when emptying a pipette

Answer 23

Drop is already taken into account in the calibration of the pipette. If You blow out last drop then you have more than 25cm and you have no idea how many moles you have transferred

Question 24

How to fill a burette

Answer 24

Clamp burette vertically in retort stand
Lower burette over edge of bench and ensure tap is closedRinse burette with both deionised water and the acid and discard rinsing
Place funnel into burette and fill with acid above the 0 line
Remove funnel
Place waste beaker under tap and open tap to fill the space below the tap
Allow acid to flow out until the bottom of the meniscus rests on the 0 mark at eyelevel