Flashcards in Acid-base Titrations Deck (19):
What is a titration?
This is a technique used to accurately measure the volume of one solution that reacts exactly with another solution.
What three things can titration so be used for?
Finding the concentration of a solution
Identification of unknown chemicals
Finding the purity of a substance
Why is checking for purity an important part of quality control?
Tiny amounts of impurity can cause harm, especially in medication.
What is a standard solution?
A solution of a known concentration.
What is used to make up a standard solution?
A volumetric flask.
Wh does the volumetric flask need to be inverted slowly a few times when making a standard solution?
This mixes the solution thoroughly and ensure that the titration results are consistent.
What apparatus is required for a titration?
To how many places is the burette reading?
What is the last decimal place when taking the burette reading?
Either 0 or 5.
What is the end point in a titration?
The point in a titration where the indicator changes colour; the end point indicates when the reaction is just complete.
What do you use when calculating the mean titre?
You must use the closest accurate titres only.
How many times should you repeat the titre?
Until two results are within 0.10cm3 of each other.
What would happen if you were to include the inaccurate titres when calculating the mean titre?
You would use the accuracy of the titration.
What will you know from the results of the titration?
Both the concentration and reacting volume of one of the solutions.
Just the reacting volume of the other solution.
How do you find out the concentration of the other solution?
Find the moles of the solution you know the volume and concentration of.
Use this information and the equation to find the number of moles in the other solution.
Find out the missing information.
What should you always do in a titration?
Swirl the conical flask.
What type of flask is used in a titration?
A conical flask
What is used to identify the end point.