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College & University



chemical sleuthing HELP!

Poll Question: chem

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happy07 Newbie

Joined: 31 January 2011
Posts: 2

Posted: 08 February 2011 at 9:38pm | IP Logged
please click on the links below to help me out..

Edited by happy07 - 08 February 2011 at 10:13pm

akhl IF-Rockerz

Joined: 30 March 2007
Posts: 5247

Posted: 10 February 2011 at 5:44am | IP Logged
Answers to
A forms bubbles, bubbles/blue and bubbles. Therefore A is baking powder.
A forms bubbles/blue with Y. Therefore Y is iodine.
B forms bubbles with one liquid and has NR with other liquids. Therefore, B is baking soda.
B forms bubbles with X. Therefore X is vinegar.
Therefore the remaining liquid Z is water.
C has NR with all the three liquids. Therefore, C is table salt.
D has NR with two liquids and blue color with one. Therefore, D is starch.

A  Baking Powder
B Baking Soda
C Table Salt
D Starch

X Vinegar
Y Iodine
Z Water

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akhl IF-Rockerz

Joined: 30 March 2007
Posts: 5247

Posted: 10 February 2011 at 6:02am | IP Logged

Answers of

1 and 3 form gas bubbles. Therefore, between them one is HCl and the other is Na2CO3.
Between HCl and Na2CO3, it is Na2CO3 which gives NH3 odor. Between 1 and 3, it is 1 which gives NH3 odor.
Therefore 1 = Na2CO3
and 3 = HCl

Na2CO3 gives NH3 order with (NH4)2SO4 and 1 gives NH3 odor with 4
Therefore 4 = (NH4)2SO4

The remaining from first table is BaCl2 and from second table is 2.
Therefore 2 = BaCl2

1 Na2CO3
2 BaCl2
3 HCl
4 (NH4)2SO4

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