Using Concentrations in Solution

BTEC Applied Science
Extended Certificate and Diploma

Where does it lead??
Pharmacist
Forensic Scientist Nurse
Research
Scientist
Environmental Physiotherapist
Scientist
Engineer
What is it?
• An alternative vocational A-level equivalent, which is
equivalent to 1 A Level (360 GLH) Extended
certificate
• An alternative vocational A-level equivalent, which is
equivalent to 2 A Levels (720 GLH) Diploma
• It includes topics on all 3 areas of Science: Biology,

Chemistry and Physics
O It is vocational – it links directly to the jobs that
Scientists do e.g. in hospitals, labs etc
O It includes assignment work and exams
BTEC Applied Science
O Offers pupils modern, work-related qualifications

opening the door to higher education and careers.
O Clear purpose and support defined progression
routes into higher education or employment.
O Students build high level skills such as teamwork,
creative thinking and presentation skills.
O Develop independent research and study skills
essential at university.
Aim of the extended certificate:
To provide a broad base of study for the
Applied Science sector, forming part of a
programme of study including other courses
e.g. BTEC Nationals or A levels.
Progression to: Higher education as part of a

larger programme of study which includes
other vocational or general qualifications, such
as other BTEC subjects or A Levels.
1 optional choice: Diseases and Infections unit 12.

You will sit unit 3 in January 2020
You will sit unit 1 June 2020
Aim of Diploma:
For learners who want to focus on Applied
Science this qualification offers a substantial
programme of study, with space for additional
subjects to be studied alongside.
Progression to:
A career in Applied Science, via higher
education or entry-level employment
2 optional choices:
Diseases and Infections unit 12
Physiology of the human body unit 8
You will sit unit 3 in January 2020
You will sit unit 1 June 2020
About BTEC and vocational
courses
Although viewed by some, to be not as
challenging as A Levels, I found it
catered to my individual learning style
(Kinaesthetic/visual) and not only
stretched me academically, but provided
a wonderful balance of academia,
practical assignments and crucial
employability skills.
Title: - Using Concentration in
Solution in Mol/dm3
Learning Outcomes:
• To be able to state that concentration is
measured in mol/dm3
• To be able to calculate the concentration of
solutions when the volume is given.
• Titrate HCl with NaOH using an indicator of
Phenolphthalein.
• Use the titre results and know volumes of
NaOH and concentration, to calculate the
concentration of the HCl.
https://www.youtube.com/watch?v=wPG
VQu3UXpw
https://www.youtube.com/watch?v=MEQ
1YGxfAQ4
Concentration = no. of moles
volume
RECAP
Learn this formula triangle! convert the volume
to dm3 first by
dividing by 1000.
number
of moles
concentration
n
(in mol dm-3)
volume
c v (in dm3)
N=CxV
1000
1 litre
Concentration = 1000 cm3
= 1 dm3
Concentration is a measure of how crowded
things are.
The concentration can be measured in moles
per dm3 (ie. moles per litre).
So 1 mole of ‘stuff’ in 1dm3 of solution has
a concentration of 1 mole per dm3
(1mol/dm3).
The more solute you dissolve in a given
volume, the more crowded the solute
molecules are and the more concentrated the
solution.
Example 2:
How many moles of sodium chloride are
in 250cm3 of a 3 mol dm-3 solution of
sodium chloride?
The question tells us the volume and

concentration, so use the formula:
n = c x v = 3 x 0.25 = 0.75 moles
convert the volume
to dm3 first by
dividing by 1000.
Example 3:
How many moles of sodium chloride are
in 750cm3 of a 2 mol dm-3 solution of
sodium chloride?
The question tells us the volume and

concentration, so use the formula:
n = c x v = 2 x 0.75 = 1.5 moles
convert the volume
to dm3 first by
dividing by 1000.
Example 4:
Calculate the concentration of sodium
chloride are in 800dm3 of a 40 mol
solution of sodium chloride?
We are going to discuss a chemical method called a titration..
What is a titration?-quick search

Titration
https://www.youtube.com/watch?v=rLc148
UCT2w
Titration apparatus
Titration calculations
Titration
Titration is a technique that can be used to accurately analyse the
concentrations of substances in solution.
safety filler burette
stand
pipette
conical
beaker
flask
Titrations are often carried out by using a Neutralisation

reaction between an acid and an alkali.
Titrations
Are used to either:
-Determine the volume of acid and alkali needed
for neutralisation
-Determine the concentration of acid or alkali.
If the concentration of the other reactant is
known.
Things you need to know:

 The Acid is usually in the BURETTE
 The Alkali is usually in the CONICAL FLASK
How does titration work ?
Imagine you have a sample of hydrochloric acid
and you need to know its concentration.
First, measure out a specific amount of

the acid, and neutralise it with a standard
solution of an alkali. Measuring the
amount of alkali that is needed to
neutralize the acid will allow you to work
out the concentration of the acid.
You use an indicator to judge when this happens. The point at which it is
exactly neutralised is called the end point. The indicator changes colour
at the endpoint which when performed well, provide accurate and
precise results
Titration calculations (extension)
How are the results of a titration used to calculate the
concentration of an unknown acid solution ?
Titration Attempt 1 Attempt 2 Attempt 3

initial burette
0.0 0.0 19.9
reading (cm3)
final burette
20.0 19.9 40.0
reading (cm3)
volume of NaOH 20.0 19.9 20.1
added (cm3)
Average volume of NaOH = (20.0 + 19.9 + 20.1)/3

= 20.0 cm3
Standard solutions
Making a standard solution
https://www.youtube.com/watch?v=xBKyj
XUhJy0
How does titration work ?

Using Concentrations in Solution

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BTEC Applied Science

Extended Certificate and Diploma

Forensic Scientist Nurse

• It includes topics on all 3 areas of Science: Biology,

O Offers pupils modern, work-related qualifications

Progression to: Higher education as part of a

1 optional choice: Diseases and Infections unit 12.

The question tells us the volume and

The question tells us the volume and

What is a titration?-quick search

safety filler burette

Titrations are often carried out by using a Neutralisation

Things you need to know:

First, measure out a specific amount of

Titration Attempt 1 Attempt 2 Attempt 3

Average volume of NaOH = (20.0 + 19.9 + 20.1)/3

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