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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 ...

www.answers.com/Q/What_color_will_blue_litmus_paper_turn_in_presence_of_a_strong_base

Red litmus turns Blue in the presence of base. Linda Luchii. + 3 others found ... Good luck! ... What color does blue litmus paper turn into when dipped into a base? It turns blue ... well, blue litmus stays blue....while red litmus goes blue....:) Edit.

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

Jan 26, 2012 ... An indicator changes color when it encounters an acid or base. ... Consequently, the color an anthocyanin solution turns can be used ... 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.

www.tutorvista.com/chemistry/red-litmus-paper-blue

Litmus paper is used to test whether the given solution is acidic or alkaline in nature. ... In other words acids change blue litmus paper to red; bases change red ... When a red litmus paper is immersed in a base or alkaline, the red litmus paper turns blue ... The greater the concentration of OH- ions, the stronger is the base.

www.esrl.noaa.gov/gmd/outreach/info_activities/pdfs/LA_the_ups_and_downs_of_ph.pdf

rest of the body because it is very harsh and can cause serious damage. The lining of the ... The pH scale is used to classify substances as acids and bases. ... Most of the cells in living things cannot live in the presence of a strong acid. ... Litmus is a paper coated with an indicator that turn red in an acid and blue in a base.

www.umanitoba.ca/outreach/crystal/Support%20Files/Experimental%20Skill%20Development/Measuring%20pH%20-%20Experimental%20Skill%20and%20Investigation.doc

Specifically they would use red and blue litmus paper, phenolphthalein, and ... Most the substances used for this activity will not be very strong, so they will not be very ... some paper indicators change colour in the presence of acids and bases: ... The pH of a substance is used to determine the strength of an acid or a base.

www.healthline.com/health/pregnancy/premature-rupture-tests

Jan 8, 2016 ... If you notice leaking fluids, use a pad or paper to absorb some of the fluid. ... The strips will turn blue if the pH is greater than 6.0. ... the presence of infection by testing the amniotic fluid; the degree of fetal lung development, to determine if the baby's lungs are ... You may have to stay in bed during this time.