PAG 2 Acid-base titration

Question 1

outline how to make a standard solution

Answer 1

weigh solid in a weighing boat using a weighing scale

add solid to a beaker, rinsing the weighing boat with distilled water to ensure all of the solid is added to the beaker

dissolve solid in beaker by adding distilled water

use a funnel to transfer beaker solution to a volumetric flask, again rinse the beaker to ensure all of solution is added

fill volumetric flask up to the graduation line

stopper the flask and invert multiple times

Question 2

what is a standard solution?

Answer 2

solution of known concentration

Question 3

what is used to make a standard solution?

Answer 3

volumetric flask

Question 4

what would happen if the volumetric flask was filled with water past the graduation line?

Answer 4

produces a larger titre
solution more dilute so requires more acid to neutralise

Question 5

from where is the graduation line read from?

Answer 5

the bottom of the meniscus at eye level

Question 6

what is used to perform a titration?

Answer 6

pipette
burett

Question 7

how many times is a pipette read during a titration?

Answer 7

once

Question 8

how many times is a burette read during a titration?

Answer 8

twice

Question 9

outline how to do titration

Answer 9

add solution to a conical flask using a pipette

add the other solution to a burette

add indicator to the conical flask

record initial volume, add the solution from the burette and record the final volume

titre = final - initial

Question 10

what would happen if there was an air bubble in the burette?

Answer 10

results would show a larger titre
must redo titration

Question 11

what would happen if the meniscus was read at the top not the bottom in a titration?

Answer 11

no effect
still measuring the same difference

Question 12

what would happen if the burette was rinsed with water before adding the acid?

Answer 12

the titre would be larger as the acid would be dilute