11.8 finding concentrations by titration

Question 1

What is titration used for?

Answer 1

To find the concentration of an unknown solution by reacting it with a solution of known concentration.

Question 2

What is the standard solution in titration?

Answer 2

The solution with a known concentration.

Question 3

What indicator is used in a titration involving a strong acid and strong alkali?

Answer 3

Methyl orange.

Question 4

What color change does methyl orange show in titration?

Answer 4

It changes from yellow in alkali to red in acid.

Question 5

How do you calculate the moles of a substance in titration?

Answer 5

Moles = concentration (mol/dm³) × volume (dm³).

Question 6

What is the equation used to find the concentration of an acid in titration?

Answer 6

Concentrationofacid= volumeofacid(dm³)
——————————-
molesofacid
​

Question 7

In a titration, what volume of alkali is typically measured?

Answer 7

25 cm³ using a pipette.

Question 8

How do you convert cm³ to dm³?

Answer 8

Divide the volume in cm³ by 1000.

Question 9

What is the purpose of a burette in titration?

Answer 9

To add the acid slowly to the alkali until the indicator changes color.

Question 10

What is the end-point in titration?

Answer 10

The point at which the indicator changes color, indicating the reaction is complete.