7 – Standardising a Hydrochloric Acid Solution (LC 2027) (Leaving Cert Chemistry): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What does standardising a solution mean?
What does standardising a solution mean?
Finding its exact concentration
Why must hydrochloric acid solutions be standardised regularly?
Why must hydrochloric acid solutions be standardised regularly?
They lose concentration over time
What is the mole ratio of to in the standardisation reaction?
What is the mole ratio of to in the standardisation reaction?
1:2
Why is sodium carbonate suitable as a primary standard?
Why is sodium carbonate suitable as a primary standard?
Stable, pure, doesn't absorb moisture
What is the purpose of methyl orange in this experiment?
What is the purpose of methyl orange in this experiment?
To detect the end point
Why should the pipette be rinsed with sodium carbonate solution before use?
Why should the pipette be rinsed with sodium carbonate solution before use?
To avoid dilution
What colour change indicates the end point in this titration?
What colour change indicates the end point in this titration?
Yellow to red/pink
For results to be concordant, they must agree within what range?
For results to be concordant, they must agree within what range?
0.1 cm³
Why should the conical flask sides be washed down with deionised water during titration?
Why should the conical flask sides be washed down with deionised water during titration?
Ensures complete reaction occurs
Which mistake should be avoided when preparing the conical flask?
Which mistake should be avoided when preparing the conical flask?
Rinsing it with either solution
Which part of the meniscus should be used for burette readings?
Which part of the meniscus should be used for burette readings?
The bottom
How many accurate titrations should be carried out at minimum?
How many accurate titrations should be carried out at minimum?
At least three
