2+3- Making Standard Solution + Titration

Question 1

How do you accurately weigh the mass used when making a standard solution

Answer 1

Weigh by difference

1-Weigh mass of weighing boat
2- mass of weighing boat + solid
3- mass of weighing boat after solid has been transferred out

Question 2

Method of making a standard solution

Answer 2

Question 3

Type of apparatus used to make standard solution

Answer 3

250cm3 volumetric flask

Question 4

When making a standard solution in core prac 2 , what do you do when filling up 250 volumetric flash to ensure you got all the solid sample

Answer 4

Wash out beaker which held solid with distilled water and add washings to volumetric flash

Question 5

Before a titration what must be done to equipment eg: Burette

Answer 5

Rinse with appropriate solution your titrating with = avoid dilution of solution your titrating with affecting results

For example in core prac 2 in the Burette the standard solution is put = before titration rinse burette with standard solution

Question 6

Describe the method of the titration in core prac 3 where you have the standard solution in the burrette and the unknown conc solution in the conical flash

Answer 6

Question 7

Percentage uncertainty equation

Answer 7

Uncertainty range on apparatus / Actual reading taken
X number of readings x 100

Question 8

Do larger titres/ volumes calculated in titrations give larger or smaller percentage uncertainty’s

Answer 8

Smaller