PAG 4 Identifying unknowns

Created by: sianxxxxxxxxx
Created on: 18-08-20 10:54

method

add 2 drops of unknown to the circles, add BaCl2, add 2 drops of unknown and 2 drops of HNO3, add 2 drops of unknown and 2 drops of silver nitrate and 3 drops dilute ammonia, place 1 cm3 of unknown to test tubes, then 1cm3 of NAOH, heat water and

1 of 6

method 2

place test tubes in boiling.Place PH paper in the mouth of test tube

2 of 6

control variables

amount of each chemical added to unknown-use dropper/pipette, amount of unknown-use dropper/pipette

3 of 6

dependent variable

final colour product for each reaction

4 of 6

observations

sulphate=colourless -> white in BaCl2//carbonate=fizzing ->HNO3//Iodide=yellow ppt in silver nitrate +dilute ammonia//chloride=white ppt ->lime/dark green PH alkali//HCL=white ppt->orange PH acid

5 of 6

evaluation

pipette may be inaccurate

6 of 6

Other cards in this set

Card 2

Front

method 2

Back

place test tubes in boiling.Place PH paper in the mouth of test tube

Card 3

Front

control variables

Back

Card 4

Front

dependent variable

Back

Card 5

Front

observations

Back

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PAG 4 Identifying unknowns