Titration Internal Part A

Question 1

When measuring the 20ml aliquot of the consumer sample what was used and why

Answer 1

A pipette was used instead of a measuring cylinder because a pipette is a more accurate tool for measuring small volumes.

Question 2

How can we measure accurately using the pipette

Answer 2

We look at the miniscus at eye level to avoid parralex error so we read the measurements correctly.

Question 3

Why was a volumetric flask used and how is it used

Answer 3

A volumetric flask is a more accurate tool for measuring larger volumes.

Question 4

How do you measure accurately with a volumetric flask

Answer 4

By looking at the bottom of the miniscus at eye level to avoid parralex error, so results are read correctly

Question 5

How did I ensure validity

Answer 5

I ensured my procedure would allow for titrations between 10-25ml. This is because titrations below 10ml are too small and are likely to have more errors. Titrates above 25ml are time consuming and waste quantities of chemicals and can lead to errors if the burette has to be refilled mid titration

Question 6

When calculating the expected volume i had to do what

Answer 6

I had to ensure my results were in range so I could understand a successful following titration procedures. I discovered that if I were to use a dilution ratio of xxxx using a xx pipette and xxx volumetric flask, my result would be xxxx which is/isn’t in desired range