4.4 Gravimetric Analysis

Question 1

gravimetric analysis use

Answer 1

determine the mass of an element or compound in a substance

Question 2

used to determine the mass of an element or compound in a substance

Answer 2

gravimetric analysis

Question 3

technique of gravimetric analysis

Answer 3

• using an accurate balance, including the tare function
• using a weighing boat
• weighing by difference
• weighing accurately approximately
• heating to a constantly mass

Question 4

heating to a constant mass

Answer 4

• heating a substance
• allowing to cool in a desiccator to prevent absorption of water
• weighing
• repeating the steps of heating, cooling and weighing until no further changes in mass are observed

Question 5

• heating a substance
• allowing to cool in a desiccator to prevent absorption of water
• weighing
• repeating the steps of heating, cooling and weighing until no further changes in mass are observed

Answer 5

heating to a constant mass

Question 6

method of gravimetric analysis

Answer 6

• The substance is converted into another substance of known chemical composition, which can be readily isolated and purified
• The conversion can occur either through precipitation or volatilisation
• In precipitation conversion the substance undergoes a precipitation reaction. The precipitate is separated from the filtrate and the filtrate tested to ensure the reaction has gone to completion. The precipitate is washed, dried to constant mass and then weighed
• In volatilisation conversion the substance is heated and any volatile products (often water) are evaporated. The substance is heated to constant mass and the final mass recorded

Question 7

• The substance is converted into another substance of known chemical composition, which can be readily isolated and purified
• The conversion can occur either through precipitation or volatilisation
• In precipitation conversion the substance undergoes a precipitation reaction. The precipitate is separated from the filtrate and the filtrate tested to ensure the reaction has gone to completion. The precipitate is washed, dried to constant mass and then weighed
• In volatilisation conversion the substance is heated and any volatile products (often water) are evaporated. The substance is heated to constant mass and the final mass recorded

Answer 7

gravimetric analysis