This is my assignment for Unit 2A on Titration. I have achieved DISTINCTION on this assignment including other assignments as well. This assignment contains both theory and practical work including my calculations, pictures of my graph, and conclusions.
SIDENOTE: These assignments should only be...
A standard solution is a solution which contains a precisely known
concentration of an element or a substance.
Equipment:
- Weighing balance
- Anhydrous sodium carbonate
- Large beaker
- 150cm³ distilled water
- Weighing boat
- Stirring rod
- 250cm³ volumetric flask
Method:
- First of all, calibrate the weighing balance by pressing start and checking that
the reading is zero.
- Place the weighing boat onto the weighing balance to calibrate it, by recording
the mass which should be zero.
- After, place the anhydrous sodium carbonate into the weighing boat between
1.25g and 1.45g.
- Transfer the sodium carbonate into a large beaker and record the mass
transferred.
- Add 150cm ³ of distilled water into the beaker, and stir the sodium carbonate
to dissolve it.
- Transfer the sodium carbonate solution to a 250cm ³ volumetric flask using a
funnel, and make up the solution to 250cm³ with more distilled water.
- Place a thumb over the top of the volumetric flask and mix the solution 3
times, holding it up and down.
Results table:
Mass of weighing boat (g) 1.59g
Mass of Na²CO³ (g) 1.36g
, Mass of weighing boat + residue (g) 1.59 + 1.36 = 2.95g
Calculation:
Find the concentration of Na₂CO₃:
X= Mass of Na₂CO₃
Y = Mr of Na₂CO₃
Mass of Na₂CO₃ used = 1.36g
Mr of Na₂CO₃ = (23 X 2) + 12 + (16 X 3)
Y = 106
Moles of Na₂CO₃ = x ÷ y
= 1.36 ÷ 106 = 0.013 (3d.p.)
Concentration of Na₂CO₃ = mole ÷ volume
Mole = 0.013mol
Volume = 250cm³
cm³ ÷ 1000 = dm³
250 ÷ 1000 = 0.25dm³
0.013 ÷ 0.25 = 0.052dm³
Concentration of Na₂CO₃ = 0.052dm³
Evaluation:
In conclusion, the method used to prepare a standard solution of sodium carbonate
seems reliable as the readings collected for the mass of Na²CO³ held a high level of
accuracy as they were close to the given range of between 1.25 and 1.45g. Also, to
ensure that the method held a high level of accuracy, the weighing balance and the
weighing boat were both calibrated at the beginning of the experiment inorder to
avoid zero error as this would affect the results by giving a false reading. However,
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller rianpark. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £12.48. You're not tied to anything after your purchase.
