How to Carry Out a Titration Flashcards
What are titrations useful for?
= to determine the concentration of a solution
= e.g: an acid or an alkalai
What is the key idea of a titration?
= take a known volume of alkali- unknown concentration- this goes in the conical flask
= titrate with a acid in the burrete- known concentration- standard solution
What is the first step for titration?
= rinse a burrete with sodium hydroxide solution (do not fill all the way)- using a funell
= make sure there are no bubbles (tap the tube if they are or rinse it out)
What is the second step for titration?
= rinse a 25cm^3 pippete with sulfuric acid and use it to pippete 25cm^3 into a clean conical flask (rinsed with distilled water)
= add 2 or 3 drops of indicator (phenophlathein)
What colors should the indicator be?
= colourless in acid
= pink in alkalai
What is the third step of titration?
= place a white tile at the bottom
= titrate the sulphuric acid with the sodium hydroxide
= swirl the conical flask to distribute the contents
= close the birrute when the first permanent pink is obtained
= not the readings of the birruete
What is the fourth step?
= rinse contents of conical flask with distilled water
= repeat until you get concordant results that are within 0.1cm^3 of eachother
Why do we use a burette?
= sensitive
= goes up in 0.1 intervals
= measure continious data
= half a scale- either .0 or .5
What are concordant results?
= results that are similar and reassure determined correct titre value
= within 0.10 of eachother
What is methyl orange in acid, alkali or end colour?
acid: red
alkali: yellow
end: orange
What is phenothylim orange in acid, alkali or end colour?
acid: colourless
alkali: pink
end: just pink if alkali has been used up or just colourless if acid has been all used up
