level 1 science class blog:John West

16 04 2008

Acids and carbonates………testing the gas given off and the word for today is precipitation!!

Posted by: john west in Uncategorized

Carbonates react with acids according to the word equation

acid + carbonate —> salt + carbon dioxide + water.

We know that the gas given off is carbon dioxide because it turns limewater ( a solution of calcium hydroxide in water) milky

…………and now for experts.

Most of you spotted that the milky carbon dioxide solution goes clear again. First person to post a comment that gives the equation for this reaction wins a Mars bar.

and now in no particular order…

All the information is here

and the next video……..warning…this video contains language that may offend

There are a few weird extras in this movie

….and the word here is PRECIPITATE!!

This entry was posted on Wednesday, April 16th, 2008 at 7:44 am and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

3 Responses to “Acids and carbonates………testing the gas given off and the word for today is precipitation!!”

1.   chaddorama Says:
   April 18th, 2008 at 1:21 am

   Nobody said a year 12 can’t explain it;

   Limewater + Carbon Dioxide -> Calcium Carbonate + Water
   [Ca(OH)2 + CO2 -> CaCO3 + H2O]

   The Calcium Carbonate is the white suspension formed, which is insoluble in water. This causes the cloudiness.

   Continued passing of Carbon Dioxide through the cloudy limewater makes the cloudiness dissappear. Due the the formation of soluble Calcium Bicarbonate.

   Calcium Carbonate + Water + Carbon Dioxide -> Calcium Bicarbonate
   [CaCO3 + H2O + CO2 -> Ca(HCO3)2

   Pretty easy stuff!
   Now where’s my Mars bar? Hahahahaha!

2.   johnwest Says:
   April 18th, 2008 at 6:38 pm

   ……..will have to ban you from all competitions Chadd to give everyone else a chance!!…..a mars bar is yours first day back

3.   chaddorama Says:
   April 18th, 2008 at 10:14 pm

   Sorry, I’ll lay low for a while =)

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