Question

When performing titrations, good technique includes: (select all correct answers)

Question options:

a)	adding the indicator at the beginning.

b)	talking to your partner as the base is being added.

c)	waiting for 30 s after the first color change to ensure that the endpoint has been reached.

d)	performing multiple trials to ensure that the concentration value determined in the trials is accurate to within 2%.

e)	stirring the solution constantly

f)	waiting a few minutes after adding each drop of base.

g)	adding the base more rapidly at first, then slowing the addition as we approach the endpoint.

h)	carefully noting the volume of base added. it is a lab question and I tried a lot of time to answers but I don't find the right choice

Answer 1

The correct things are

a) adding the indicator at the beginning.

b) waiting for 30 s after the first color change to ensure that the endpoint has been reached.

c) performing multiple trials to ensure that the concentration value determined in the trials is accurate to within 2%

d) stirring the solution constantly

e)adding the base more rapidly at first, then slowing the addition as we approach the endpoint.

f) carefully noting the volume of base added.

We should not do

a) talking to your partner as the base is being added: It will increase the risk of error in the titration readings, may cause accident.

b) waiting a few minutes after adding each drop of base: Acid base titration are fast reaction so no need to wait.