Coffee is generally acidic, thus the blue litmus paper will turn red. However, the pH of coffee can vary depending on the kind. Dark roasted coffees tend to be more alkaline and the blue litmus paper may stay blue when dipped.
I think you meant baking soda. Baking soda is basic, so red litmus paper will turn blue.
It turns blue. Since chalk ( CaCo3) is a base and when pink litmus paper reacts with a base it turns blue
the color of the litmus paper does not change.
Red
soap is basic therfore, soap solution will keep blue litmus paper blue and turn red litmus paper blue
When dipped in coffee, pH paper will change color based on the acidity or alkalinity of the coffee. If the coffee is acidic, the pH paper will turn a different color than if it is alkaline. This color change indicates the pH level of the coffee.
Coffee has an acidic pH - red with litmus paper.
orange
Otgfcch
Blue litmus paper will likely remain blue when dipped in spinach as spinach is not acidic enough to cause a color change to red.
Blue litmus paper turns RED in an acid. Red litmus paper turns BLUE in a base.
blue
When a strip of litmus paper is dipped into an acidic solution, it turns red. This is because litmus paper changes color in response to the pH of the solution it comes into contact with. In acidic solutions, the paper turns red, indicating low pH.
It stays blue.
dark green
blue
blue