4
   

why litmus paper changes color ?

 
 
5him
 
Reply Sat 26 Dec, 2015 02:32 am
We know that the H+ of an acid changes the color of blue litmus into red.but i want to know about the main chemical change or reaction for which under acidic condition blue litmus turns red.
 
Tes yeux noirs
 
  4  
Reply Sat 26 Dec, 2015 02:43 am
Red litmus contains a weak diprotic acid. When it is exposed to a basic compound, the hydrogen ions react with the added base. The conjugated base, formed from the litmus acid, has a blue color, so the wet red litmus paper turns blue in alkaline solution.
5him
 
  1  
Reply Sun 17 Jan, 2016 01:17 am
@Tes yeux noirs,
Thank u so much .
0 Replies
 
marilyncheng
 
  0  
Reply Thu 11 Feb, 2016 12:17 am
@5him,
Once you put acid, the acid will introduce an excess of H+(since it donates a proton, once it is in a water solution), bringing an excess of H+ and will shift the reaction to the left, producing more HA and turning the color red.
metricphile
 
  1  
Reply Thu 14 Jul, 2016 11:32 am
@marilyncheng,
A corollary to that question: how does, and to what extent, does bond strength reflect the absorption of light? Bond strength being a general reference to interactions between certain bonds, in this case litmus paper. Or rather a better question is, what can describe the relationship between bond strength and light absorption?
0 Replies
 
selectmytutor
 
  1  
Reply Fri 2 Dec, 2016 05:25 am
@5him,
Under acidic conditions, the solution is red, and under basic conditions, the solution is blue. Chemical reactions other than acid-base can also cause a color change to litmus paper
0 Replies
 
 

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