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Titration level 1 labnotebook
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Titration level 1.
In level 1, you'll analyse samples from a river that has been contaminated with acid. You'll perform titration experiments to work out the concentration of acid in the samples.
In each activity you'll be able to collect points. At the end of the level you can restart to improve your skills.
Video 100 Points
Comprehension 100 points 1 attempt.
Hydrochloric acid fully dissociates when dissolved in water. The pH of water is approximately 7 which means it is neutral. When an acid and alkali react to form water and salt it is called neutralisation. A titration experiment can be used to determine the unknown concentration of acid using a known concentration of base. An indicator helps us to see the point of neutralisation during a titration experiment by causing a colour change.
Acids and alkalis 80 Points 2 Attempts
pH 0-2 pH 7 pH 12- hydrochloric acid distilled water sodium hydroxide sulfuric acid potassium hydroxide nitric acid calcium hydroxide
Phenolphthalein is an indicator which changes colour close to the point of neutralisation and is used to show the end- point of this titration. When adding a strong acid to a strong base the phenolphthalein indicator changes colour from pink to colourless.
Measuring Mass 100 Points 1 Attempt
You correctly used the balance to accurately weigh: Mass of sodium hydroxide = 1 g This was transferred to a beaker for you ready for the next step of the experiment.
Standard solution 100 Points
First the sodium hydroxide powder was dissolved in distilled water.
Next you transferred to solution to a 250 cm 3 volumetric flask and rinsed the beaker with more water.
Finally you made up the standard solution to the to the 250 cm 3 level using a dropping pipette
Alkali concentration 100 Points
You calculated the molar mass for sodium hydroxide as 40 g mol-1. Then you worked out the amount of sodium hydroxide you used was0 mol. Finally you calculated the concentration of your stock solution as being 0 mol dm-3.
Preparing for titration 100 Points 1 Attempt
First you rinsed a pipette with your sodium hydroxide solution.
Next you used the pipette to transfer exactly 25 3 of the solution into a conical flask and added 3 drops of phenolphthalein indicator.
Burette setup 100 Points 1 Attempt
First you rinsed a burette with distilled water. Next you rinsed the burette with your acidic contaminated river sample. Then you filled the burette with the river sample and ensured the eye level was good for reading the burette level Then you removed the funnel. Finally the burette was filled below the tap by running out some solution.
Titration analysis 100 Points
You correctly determined the concentration of acid in the river at sites B and C. Amount of sodium hydroxide = 0 mol. Amount of hydrochloric acid = 0 mol.
Concentration of hydrochloric acid at site B = 0 mol dm-3.
Concentration of hydrochloric acid at site C = 0 mol dm-3.
The pH of the river is normally neutral. The pH values increase as the concentration of HCl decreases. The pH at the site of special scientific interest is bad. The pH of the river returns to a moderate level by the time it reaches site D.
Things I did well on: Things I could improve on: Your titrations and quick response helped protect some of the wildlife at the site of special scientific interest. Three days later you sample the river at all the sites again. What do you predict your results would be?
- Multiple Choice
Topic : Acids/Bases/Salts & Equilibrium
Subject : chemistry.
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