Seperating a precipitate from a mixture

Question 1

Describe Gravity filtration

Answer 1

Filter paper in filter funnel (residue in filter paper)
Conical flask (filtrate at the bottom)

Question 2

Describe Vacuum filtration

Answer 2

Buchner funnel with filter paper
into flask with bung at the top of flask
Water pump going out of the flask

Question 3

Describe the Filtration and drying procedure

Answer 3

Filter the precipitate from the solution using gravity or vacuum filtration.
Wash the residue with water to remove soluble impurities
Dry to remove the water either by pressing between two sheet of filter paper or in air

Question 4

Describe the syringe method of measuring gas produced

Answer 4

Syringe with a tube going into a conical flask with a bung at the opening

Question 5

Describe the measuring cylinder method of measuring gas produced

Answer 5

Measuring cylinder partially submerged in a trough(bucket) of water
Tube from measuring cylinder connected to a conical flask with a bung at the opening

Question 6

Describe an enthalpy change method

Answer 6

(Clamp)
Thermometer into a polystyrene cup(insulator)
Lid to prevent heat loss
Stirrer
Beaker to hold polystyrene cup

Question 7

How to work out percentage uncertainty

Answer 7

error given
——————— x100
amount measured

Question 8

When the balance is used twice to determine a mass by difference what to do with the error

Answer 8

Multiply error by x2

Question 9

How to reduce error when collecting gas

Answer 9

Use a gas syringe to collect gas

Question 10

Why are beakers inappropriate for making standard solutions to a particular volume.

Answer 10

As their uncertainty is much greater than that of a volumetric flask

Question 11

Two ways to reduce errors in titration

Answer 11

Decrease the concentration of the solution in the burette
Increase the concentration of the solution in the conical flask