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en.wikipedia.org/wiki/Bromothymol_blue

Bromothymol blue is a pH indicator. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7). A common use is for measuring the presence of carbonic acid in a liquid. ... Amniotic fluid typically has a pH > 7.2, bromothymol will therefore turn blue when brought in ...

en.wikipedia.org/wiki/Methylene_blue

Methylene blue, also known as methylthioninium chloride, is a medication and dye. ... Use often turns the urine, sweat, and stool blue to green in color. ... Methylene blue can reduce the half life of methemoglobin from hours to minutes. .... The presence of free dye solution can be checked with stain test on a filter paper.

www.answers.com/Q/Paper_that_is_blue_will_turnstay_what_color_in_the_presence_of_a_strong_base

Paper that is blue will turn/stay _____ in the presence of a strong base.

www.answers.com/Q/What_color_will_blue_litmus_paper_turn_in_presence_of_a_strong_base

Paper that is blue will turn/stay _____ in the presence of a strong base. Edit ... What color does litmus paper turn when dipped in a strong base? well, blue litmus ...

www.testprepreview.com/modules/generalscience1.htm

Mar 1, 2017 ... C. Optimum pressure. D. Systolic pressure. 10. Litmus paper that is blue will turn/ stay _____ in the presence of a strong base. A. Orange B. Red

chemistry.elmhurst.edu/vchembook/186indicator.html

The most common indicator is found on "litmus" paper. It is red below pH 4.5 and blue above pH 8.2. ... Base, stays same, turns blue ... A properly selected acid- base indicator can be used to visually "indicate" the approximate pH of a sample.

genchem.rutgers.edu/litmus.html

red litmus turns blue in base; blue litmus turns red in acid. The key word is turns. If red litmus is put in a solution and remains red it does not mean the solution is ... Gasses change the color of litmus paper over its entire exposed surface, not just  ...

www.quia.com/jg/347025list.html

Blue. Acids will turn litmus paper what color? Red. The PH of 7 is based on the PH of what ? Water. A PH of 2 represents a_______. Strong Acid ... Turmeric indicator solution stays yellow in the presence of acids and turns what color in the  ...

www.scientificamerican.com/article/bring-science-home-cabbage-chemistry

Jan 26, 2012 ... To tell if something is an acid or a base, you can use a chemical ... Very acidic solutions will turn an anthocyanin red whereas neutral ... In the bowl, you should now have only liquid that will either be purple or blue in color. ... To reveal the message, paint cabbage-indicator over the paper with a paintbrush.