examination of alum lab

 Essay about analysis of alum lab

Research of Alum, AlK(SO4)2・12 H2O

Partner: Cindy

Date: Sep 15, 2011

Purpose:

The goal of this research is to validate the id of the alum by seeking the properties from the substance; burning point and mole percentage of the water to the anhydrous. Every compound has exceptional characteristics that assist to determine the identity of it. Some of the values of the properties could be compared to the experimental values. In real life, this could be used to determine the unknown medicines.

Speculation:

The hypothesis is that the alum can be confirmed by choosing the properties; some of the melting level of alum is 80. 5(http://cookeatshare.com/popular/melting-point-of-alum) as well as the actual skin mole ratio of alum to water is 12: you, By finding the melting level and alum to drinking water mole ratio, it can be when compared to real beliefs

Equipment Portion 1:

Aluminium potassium sulfate (1. 5 g)

one hundred and fifty mL beakers (3)

Bunsen burners (3)

Capillary tubes (3)

Mortar and pestle

Notched arreter (3)

Engagement ring Stand (3)

Thermometer, 0c ~ 100c (3)

Grip (3)

Glycerol (few drops)

Equipment part 2:

Aluminium potassium sulfate (6g)

Stability, 0. 0001g precision

Bunsen burner (3)

Crucible and lid, 30mL (3)

Tongs (3)

Diamond ring stands (3)

Pipe control (3)

Line gauzes (3)

Procedure portion 1:

1 . Pack the alum into a capillary tube with a length of 1 ~ 2 centimeter 2 . Tie the capillary tube towards the thermometer by using a rubber band with really opening inverted.

3. Dip the top of the thermometer in to glycerol

5. Push the thermometer throughout the stopper

your five. Fasten the stopper which has a clamp

six. Fill the beaker with 150 mL distiller water covering the suggestion of the thermometer and the capillary tube in the beaker.

7. boil the beaker before the alum in the capillary conduit dissolves 8. Recoded the temperature change at which the alum touches

9. Repeat step #1~8 for 2 more studies

Procedure part 2

1 ) Get a diamond ring stand that includes a ring clamp.

2 . Place a clay water line stem on top of the diamond ring clamp plus the Bunsen burner beneath the ring clamp

several. Adjust the ring clamp so that it is definitely one centimeter above the band clamp 4. Place the crucible on top of the clay water pipe stem a bit slanted aside 5. Lumination the Bunsen burner and heat this

6. Warmth it until the crucible transforms red hot

7. Employing tongs, eliminate the crucible make it around the wire gauze. 8. Wait for an crucible cool-down completely

being unfaithful. Mass the crucible and record the precise mass.

12. Add about 2g of alum and record the complete mass used

11. Place the crucible together with the clay-based pipe come a little inclined to the side 12. Gently temperature the crucible until bubbling

13. Following your bubbling has stopped, highly heat it for additional five minutes 13. Using a new tong/tanga, remove the crucible and place it on line gauze 12-15. Wait for 5 minutes for it to cool down

of sixteen. Mass the crucible and record the actual mass of it

17. Replicate procedure #1~#16 for 2 more trial offers

Results:

Analysis of alum

Part you: (metling point)

Analysis of alum

Trial 2

Trial 3

Tested melting stage (Celsius) 87

91. a few

89

Literary works melting stage (Celsius) ninety two. 5

http://cookeatshare.com/popular/mel

ting-point-of-alum

ninety two. 5

92. 5

Analysis of alum

Trial 1

Part a couple of: Determination with the Water of Hydration in Alum Crystals

Analysis of alum

Trial 1

Trial 2

Trial 3

Mass of crucible and cover (g)

forty five. 9447

41. 5092

43. 2373

Mass of crucible, cover, and alum deposits (g)

forty seven. 9482

43. 5127

forty five. 2412

Mass of alum crystals (g)

2 . 0035

2 . 0035

2 . 0039

Mass of crucible, cover and alum after warming #1 (g) 47. 0442

42. 6023

44. 336

Mass of crucible, cover and alum after heat #2 (g) 47. 0217

42. 5846

44. 3265

Mass of water motivated off (g)

0. 9265

0. 9281

0. 9147

Mass of anhydrous alum, AlK(SO4)2 (g)

1 . 077

1 . 0754

1 . 0892

Moles H2O (moles)

zero. 05143

0. 05152

zero. 05077

Moles AlK(SO4)2 (moles)

0. 00417

0. 00416

0. 00422

Mole ratio; moles H2O/ moles AlK(SO4)2

12. 33025 12. 36992 12. 03686...

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