Question

Red cabbage turns ___________ in basic solutions.

Answer 1

Hint: We need to understand the concept of acids and bases and how they are used as indicators. Any hydrogen-containing material capable of transferring a proton (hydrogen ion) to another material is classified as an acid. A base is a molecule or ion that can take a hydrogen ion from an acid and receive it. An acid is a molecule that can contribute an H+ ion while also remaining energetically favourable after losing that ion.

Complete answer:
We need to know that the acidic compounds are characterised by a sour flavour. Blue litmus is known to become red when exposed to acids. Bases, on the other hand, have a bitter taste and are slick to the touch. The term "alkali" refers to a base that may be dissolved in water. Salts are formed when these compounds react chemically with acids. It's common for bases to turn red litmus blue.
A purple-colored solution called red cabbage indicator is used to determine if a product is acidic or basic. Red cabbage, which is commonly available in households, may be used to make a pH indicator solution. The pigment molecule flavin, also known as anthocyanin, is found in cabbage and changes colour based on the acidity of the solution. When the purple solution reacts with anything acidic, it turns red, and when it reacts with something basic, it turns green. If a material does not change its colour, it is considered mainly neutral.
Hence, red cabbage turns green in basic solutions.

Note:
We must note that the pH scale may be used to determine the quantitative value of a substance's level of acidity or basicity. The pH scale is the most widely used and accepted method of determining how acidic or basic a thing is. A pH scale ranges from $0$ to $14$, with 0 indicating the most acidic and $14$ indicating the most basic. Litmus paper may also be used to determine if a chemical is acidic or basic. Red litmus paper and blue litmus paper are two forms of litmus paper that may be used to distinguish acids and bases. In acidic conditions, blue litmus paper turns red, whereas red litmus paper turns blue under basic or alkaline circumstances.