If you add red litmus paper and it remains red, then you add blue litmus paper and it remains blue, then the the solution is neutral.
Kamal
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.
A household product that will turn litmus paper red is an acidic substance, such as vinegar or lemon juice. Acids have a pH below 7, which is the range that litmus paper turns red in.
Any acid will turn litmus paper red, Household examples would be most juices, vinegar, and carbonated drinks.
Red litmus paper turns blue when it comes in contact with a household cleaner that contains ammonia. This color change occurs due to the alkaline nature of ammonia, which causes red litmus paper to undergo a chemical reaction and turn blue.
Red litmus paper dipped in vinegar will turn red, indicating that vinegar is acidic. This change in color is due to the red litmus paper reacting with the acidity of the vinegar, causing it to remain red. Litmus paper is commonly used to test the acidity or basicity of a solution by observing the color change it undergoes.
It turns blue
When blue litmus paper touches an acid it becomes red. This is the type of litmus paper that detects acids. When red litmus paper touches an acid, it will remain red. This is used to test a base.
Blue litmus paper turns red in vinegar solution because vinegar is acidic and pH below 7. The acidic solution causes the blue litmus paper to undergo a color change and turn red.
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.
When an acid touches Litmus paper it turns red (pink).
If the vinegar is strong enough to be below 4.5 pH the litmus paper will turn (or stay) red.
it turns blue litmus paper red
Because Vinegar is an acid, the litmus paper would turn red
Litmus paper turns red if the solution is acidic and blue if the solution is basic. Vinegar is an acidic solution (due to acetic acid), and will turn the litmus paper red.
If if it is red Litmus paper, then it will remain red because vinegar is acidic. (Blue Litmus paper would turn red if you dipped it into vinegar).
Litmus is used to test materials for their acidity. Blue litmus paper turns red when exposed to acid, so it would turn red when exposed to vinegar, which is acidic.
HCl (hydrochloric acid) is an acid so it will turn litmus paper red. and alkali will go from red litmus to blue.