P1 - 4.2 Titration Practical Flashcards
Chemical Changes
Why do we use titration
To find an unknown concentration of an acid or alkali
What 4 pieces of equipment do we need in titration
- pipette
- burette
- conical flask
- white tile
What is a pipette used for in titration
To accurately measure a certain volume (25cm^3) of an acid or alkali
True or False:
You should add an indicator into the burette
False
True or False:
You should not add an indicator into the burette
True
What is the burette used for in titration
To add an acid or alkali to the conical flask which can be controlled by the tap
What is the purpose of the conical flask in titration
Contains liquid from the pipette - where we will see the chemical reaction happen
What is the purpose of the white tile in titration
To place the conical flask on - to make the reaction for clear to us
Name the 8 steps in titration
1) using the pipette add 25cm^3 of alkali to a conical flask
2) add a few drops of indicator into the conical flask and put on white tile
3) fill the burette with acid and note the starting volume
4) slowly add acid from the burette into the alkali in the conical flask and swirl the conical flask to mix it
5) stop adding acid when the end point is reached (when the acid has neutralised and the indicator changes colour)
6) note the final volume reading and calculate how much acid you added in total
7) repeat until you get concordant results (volumes of acid that are within 0.10cm^3 of each other)
8) using the concordant results to calculate the mean volume of acid required to neutralise the alkali
What are the 3 indicators we can use in titration
Methyl orange
Phenolphthalein
Litmus
What colours will the indicator Methyl orange be in an acid and alkali
Yellow in alkali
Red in acid
What colours will the indicator phenolphthalein be in an acid and alkali
Pink in alkali
Colourless in acid
What colours will the indicator Litmus be in an acid and alkali
Blue in alkali
Red in acid
What indicator is yellow in alkali and red in acid
Methyl orange
What indicator is pink in alkali and colourless in acid
Phenolphthalein
What indicator is blue in alkali and red in acid
Litmus
Why do we swirl the conical flask in titration
To make sure the acid and alkali in the conical flask is evenly distributed
Why do we use indicators in titration
So we can see the pH change because without it usually acids are clear
What is the first step of titration
Using the pipette add 25cm^3 of an alkali to a conical flask
After Using the pipette add 25cm^3 of an alkali to a conical flask
What is the second step in titration
Add a few drops of indicator and put the conical flask on a white tile
After - Add a few drops of indicator and put the conical flask on a white tile
What is the third step in titration
Fill the burette with acid and take a note of the starting point volume
After - Fill the burette with acid and take a note of the starting point volume
What is the fourth step in titration
Slowly add the the acid from the burette to the alkali in the conical flask, swirling it to mix it
After - Slowly add the the acid from the burette to the alkali in the conical flask, swirling it to mix it
What is the fifth step in titration
Stop adding the acid when the end point is reached (this is when the acid has neutralised the alkali and the indicator changes colour)
After - Stop adding the acid when the end point is reached (this is when the acid has neutralised the alkali and the indicator changes colour)
What is the sixth step
Note the final volume reading and calculate how much acid you added in total
After - Note the final volume reading and calculate how much acid you added in total
What is the seventh step in titration
Repeat the titration practical until you get concordant results
After - Repeat the titration practical until you get concordant results
What is the final step in titration
Using the concordant results calculate the mean volume of acid required to neutralise the alkali
What are concordant results in titration
Results of volumes of acid that are within 0.10cm^3 of each other
What is the name given to results of volumes of acid that are within 0.10cm^3 of each other
Concordant results
