Amount Of Substance- Titration Calculation And PvNRT

Question 1

Finding the mean titre

Answer 1

Use only concordant results, values that are within 0.1 of each other, add together and divide by how many there are.

Question 2

How to make a standard solution

Answer 2

Weigh in sample bottle containing the solid on a balance
Transfer to beaker and reweigh sample bottle
Record difference in mass
Add distilled water
Strir with glass rod
Until solid is dissolved
Transfer to volumetric flask using a funnel and washings
Make up 250cm3 water
Shake

Question 3

Titration accuracy

Answer 3

Remove air bubbles- otherwise volume of air bubbles will be counted in the burette reading
Remove the funnel- otherwise solution drips and changes the reading
Swirl the conical flask- ensure all reactants are mixed, doesn’t change number of moles.

Question 4

Percentage error and how to reduce it

Answer 4

Error of equipment/ amount measured x100
Increase conc in conical flask, decrease conc in solution of burette