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which turns blue litmus to red ?

Here are some links that might be useful to you:

https://sciencenotes.org/litmus-paper-and-the-litmus-test

https://sciencenotes.org/litmus-paper-and-the-litmus-test
Litmus Paper and the Litmus Test – Science Notes and Projects
This litmus test uses red, blue, or purple litmus paper to determine whether a sample is acidic, basic, or neutral. Litmus paper is pH indicator made by treating filter paper with a solution of litmus. Litmus, in turn, is mixture of dyes made from lichens that changes color in response to acids (red) or bases (blue).

https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Acids_and_Bases/Acid_and_Base_Indicators/Acid_and_Base_Indicators

https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Acids_and_Bases/Acid_and_Base_Indicators/Acid_and_Base_Indicators
Acid and Base Indicators – Chemistry LibreTexts
30 janv. 2023It is red below pH 4.5 and blue above pH 8.2. Color Blue Litmus Red Litmus; Acid: turns red: stays same: Base: stays same: turns blue: Other commercial pH papers are able to give colors for every main pH unit. Universal Indicator, which is a solution of a mixture of indicators is able to also provide a full range of colors for the pH scale.

https://www.khanacademy.org / science / up-class-10th-science / x5d08d26681869997:acids-bases-and-salts / x5d08d26681869997:chemical-properties-of-acids-and-bases / v / litmus-solution-natural-indicator-acids-bases-and-salts-chemistry-khan-academy

https://www.khanacademy.org / science / up-class-10th-science / x5d08d26681869997:acids-bases-and-salts / x5d08d26681869997:chemical-properties-of-acids-and-bases / v / litmus-solution-natural-indicator-acids-bases-and-salts-chemistry-khan-academy
Litmus solution (Natural indicator) (video) | Khan Academy
In general, solutions with a pH value of below 7 are acidic and those with more then pH 7 are basic/alkaline. According to the question,red litmus paper turns purple in the presence of a neutral solution. This means that the solution has pH value 7. Then, if same happens with blue litmus, undoubtedly the will purple indicating …

https://www.bbc.co.uk/bitesize/guides/zf73382/revision/1

https://www.bbc.co.uk/bitesize/guides/zf73382/revision/1
Acids, alkalis and the pH scale Indicators and the pH scale – BBC
Red litmus turns blue in alkalis, while blue litmus turns red in acids. is usually more reliable, and comes as red litmus paper and blue litmus paper. The table shows the colour changes it can make.

https://sciencing.com/difference-blue-red-litmus-paper-8731865.html

https://sciencing.com/difference-blue-red-litmus-paper-8731865.html
What Is the Difference Between Blue & Red Litmus Paper?
Red Litmus Paper. When red litmus paper is placed into a basic substance, it will turn blue. If it comes in contact with an acidic or neutral substance, it will remain red. Red litmus paper is meant to test only for an alkaline pH level. Common acids include include tartar sauce, corn, bacon and beer.

https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introduction_to_General_Chemistry_(Malik)/06:_Acids_and_bases/6.01:_What_is_an_acid_and_a_base

https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introduction_to_General_Chemistry_(Malik)/06:_Acids_and_bases/6.01:_What_is_an_acid_and_a_base
6.1: What is an Acid and a Base? – Chemistry LibreTexts
The acids turn blue litmus paper to read but do not change the color of red litmus paper. Bases turn red litmus paper blue but do not change the color of blue litmus paper, as illustrated in Fig. 6.1.2. Phenolphthalein indicator turns colorless in acid and turns pink in basic solution, as illustrated in Fig. 6.1.3.

https://en.wikipedia.org/wiki/Litmus

https://en.wikipedia.org/wiki/Litmus
Litmus – Wikipedia
Litmus is a water-soluble mixture of different dyes extracted from lichens.It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity.In an acidic medium, blue litmus paper turns red, while in a basic or alkaline medium, red litmus paper turns blue. In short, it is a dye and indicator which is used to place substances on a pH …

https://socratic.org/questions/why-do-acids-change-blue-litmus-to-red

https://socratic.org/questions/why-do-acids-change-blue-litmus-to-red
Why do acids change blue litmus to red? | Socratic
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic (i.e. alkaline) conditions. The pigment in blue litmus reacts with H + ions and changes chemically so the bonds are ‘tuned’ to reflect a longer wavelength of light to appear red to our eyes. The pigment is absorbing the green wavelengths when …

https://byjus.com/question-answer/which-of-the-following-will-turn-blue-litmus-red

https://byjus.com/question-answer/which-of-the-following-will-turn-blue-litmus-red
Which one of the following will turn blue litmus red? – BYJU’S
Acids turn blue litmus red, whereas Bases turn red litmus blue. Vinegar is an acidic solution. Thus it will change the color of blue litmus to red. Explanation for incorrect options: Lime, baking soda solution, as well as washing soda solution, are alkaline in nature thus they will change the red litmus into . Therefore options B, C, and D …

https://www.thoughtco.com/what-is-litmus-paper-3976018

https://www.thoughtco.com/what-is-litmus-paper-3976018
Litmus Paper and the Litmus Test – ThoughtCo
The litmus test is performed by placing a small drop of sample onto the colored paper. Usually, litmus paper is either red or blue. Red paper turns blue when the pH is alkaline, while blue paper turns red when the pH turns acidic. While litmus paper is most often used to test the pH of liquids, it can also be used to test gases if the paper is …
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