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As soap is alkaline in nature, it turns red litmus paper blue
Blue litmus does not change when placed in a basic solution.
Washing soda is originally white in colour and no colour change takes place on heating it. A colourless gas, water vapour i.e the water of crystallization is evolved which is neutral to litmus and even turns cobalt chloride blue to pink. The left residue is sodium carbonate (white).
It will turn blue
Sour milk is acidic. Red litmus paper should not change.The sour part of sour milk is lactic acid. As litmus paper turns red when exposed to acidic compounds, litmus paper that is already red should not react when exposed to lactic acid.
As soap is alkaline in nature, it turns red litmus paper blue
detergent solution has an effect on red litmus paper because detergent solution is a base and it changes the color of red litmus(indicator) to blue when in contact with it.
The blue litmus paper will not change color. Red litmus would turn blue in the presence of ammonia. Blue litmus paper will only change color in the presence of an acid, at which point it will turn red.
acid
Washing detergent is nearly always alkaline or antacid. There are some special purpose soaps - called soapless soaps, that are mildly acidic, but they are for special purposes and not usually encountered. On the other hand, detergents with ammonia in them are strongly alkaline.
litmus paper nutral
red litmus turns blue
d-d-d-drop the bass
Blue litmus paper turns into red.
Blue litmus does not change when placed in a basic solution.
The colors of litmus is different; this depends on the pH.
It will go a pink purple couler indicating that it is an alkali.