You can make paper test strips to determine the pH of an aqueous solution by treating filter paper with any of the common
pH indicators. One of the first indicators used for this purpose was litmus. Litmus paper is paper that has been treated with a specific indicator - a mixture of 10-15 natural dyes obtained from lichens (mainly
Roccella tinctoria) that turns red in response to acidic conditions (pH < 7) and blue under alkaline conditions (pH > 7). When the pH is neutral (pH = 7) then the dye is purple. The first known use of litmus was around 1300 AD by Spanish alchemist Arnaldus de Villa Nova.
Litmus paper is handy as a general acid-base indicator, but you can get much more specific results if you use an indicator that has a more narrow test range or that offers a wider color range.
Red cabbage juice, for example, changes color in response to pH all the way from red (pH = 2) through blue at neutral pH to greenish-yellow at pH = 12, plus you are more likely to find cabbage at the local grocery store than lichen.
Comments
How to make a litmus paper from gumamela (flower)extracts?
Thanks!
How to prepare litmus paper from simple filter paper?
where is the answer to there questions?
i very! , most! , needest! it
whatever u solve it!
Very good… site…
it helps me a lot…
for my assignments…
hahah
This site has really come through for me the lst couple of weeks! It’s good to know there’s at least one solid homework guide and study aid out there!
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thank you.
this is very helpfull site
because it helps to build our base in chemistry
how does it change its color in different conditions
can’t base change red litmus to pink
heyy x
Sooooooooo stuck on a assignment we have to do for Chem.
HELP!!!
why does litmus paper change its colour in acidic and basic conditions?
how do u make litmus paper from simple filter paper
What is the derivation of the actual word “litmus”? Every source on the web describes what it does, etc., but nothing else. Thanks.
read this i had this science project there was a activity to do we had to put subsances together and put litmus paper in it and observe the reactions can you tell me how can be done so the next time i can do it and do it properly i still did not get it can you please tell me i ma really intrested it seams fun to do not really fun but you know science is fun
can the used litmus paper after drying can be used for testing other solution?
Thanks Anne Marie . After 30 years of my studying chemistry I had to refresh my knowledge about litmus paper and pH test. I took the help of Ms. Anne through her blog.I am great full to her.
Thakns again for your endevours in blog.
Abu Sayeed,Dhaka, Bangladesh, South Asia
Nice article. If you interested in ph strips why not try our site at Litmus Papers
How is red litmus paper coloured(made) red and blue litmus paper coloured(made) blue before the ph test is undertaken for acidic and basic medium? How does the colour change take place in the acidic and basic medium later?
I am anxious to get a quick reply please.
With regards,
Terence
09-10-10
change in colour of litmus in basic medium and acidic medium
How is red litmus paper coloured(made) red and blue litmus paper coloured(made) blue before the ph test is undertaken for acidic and basic medium? How does the colour change take place in the acidic and basic medium later?
I am anxious to get a quick reply please.
Is litmus paper poisonous or caustic? My cat is very sick and I am suspecting it ate one of these litmus papers for my chlorine pool. Would anybody happy to know? Please help!
u shouid have some more points
Pls tell me what can be used instead of litmus paper….????
Information given in this site is not clear. Exact information of making litmus paper or solution is not given !
What about Red litmus paper? or blue litmus paper?
what are the scales for those? Please reply ASAP I need it for a lab report, thanks
so much intresting to have this so that we can solve our problem here
what are the materials in making a litmus paer and the procedure
firstprepared an indicator then pour the indicator inceramic container cover itthe filter paper or bond paper with the indicator solution by deeping the paper in the indicator solution.air dry for five minutes. repeat the
to be contienu
what is litmus paper in chemistry
Is there a definition for litmus??
Hey, I think this was really beneficial! Thanks a bunch!
Good explanation. I would like to ask that how can we prepare it?