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Litmus

Litmus

(Science: chemistry) a dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain colouring matters related to orcin and orcein.

litmus is used as a dye, and being turned red by acids and restored to its blue colour by alkalies, is a common indicator or test for acidity and alkalinity.

(Science: chemistry) litmus paper, unsized paper saturated with blue or red litmus, used in testing for acids or alkalies.

Origin: D. Lakmoes; lak lacker _ moes a thick preparation of fruit, pap, prob. Akin to E. Meat: cf. G. Lackmus. See lac a resinous substance.


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Needing help identifying uknowns for micro lab

Tests 7A 7B SIM black/pur negative Gram negative negative Rod 2x1 3 to 4x1 Motile non pos PR lactose pos negative PR glucose pos pos Litmus alkaline didn't test FTM facultative aerobic Catalase negative negative MR pos pos VP pos Starch negative hydrolysis Amylase negative pos TSI yby ry ...

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by avon7774
Wed Jul 29, 2009 10:35 pm
 
Forum: Microbiology
Topic: Needing help identifying uknowns for micro lab
Replies: 1
Views: 101

Stomach bloating and weight gain

... juice cravings I have been having whenever I want to eat (providing an acidic environment at the time of the meal). The thought of swallowing a ph litmus paper and throwing it back up doesn't thrill me. Wonder how I could check the pH of my stomach. A question for my doctor friend.

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by kolean
Thu Jul 23, 2009 2:57 pm
 
Forum: Physiology
Topic: Stomach bloating and weight gain
Replies: 299
Views: 484636

Re: There is no scientific method

... on experimentation and observation which explores how things work, but we are all limited in knowledge. Please do not use NS and evolution as a litmus test for the scientific method. Evolution sells so it gets a pass.

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by AFJ
Sun Jul 12, 2009 2:43 pm
 
Forum: Evolution
Topic: There is no scientific method
Replies: 12
Views: 406

Indicator

... you are looking for a change in CO2 levels. Since CO2 is an acid, you could take a neutral pH substance like H2O and monitor its acid level using litmus paper--which can be purchased easily. As for the water I would use distilled water. I think the CO2 would react with the water and give you an ...

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by MichaelXY
Sun Jan 13, 2008 2:46 am
 
Forum: General Discussion
Topic: Indicator
Replies: 10
Views: 510

Indicator

... suggested that you use Barium Hydroxide BaOH. Is this hard to come by? I wonder if you could leave a vile of water in your test setup and use litmus paper to test the acid level changes of the water over time. I am sure Mr. Mistery will smack me for such a suggestion, so I am going to put ...

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by MichaelXY
Sun Jan 13, 2008 2:20 am
 
Forum: General Discussion
Topic: Indicator
Replies: 10
Views: 510
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