Britannica
Sources used in this answer
How do bases change red litmus paper?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
acidâbase reaction
Sodium sulfate, also called Glauber's salt, is, like other salts, the product of an acid-base reaction.
Bases change red litmus paper to blue.12
Litmus is a mixture of colored organic compounds derived from lichens that functions as an acid-base indicator. Because it exhibits different colors depending on the chemical environment, it is commonly used to determine whether a substance is an acid or a base. While litmus turns red in acidic solutions, it turns blue in alkaline (basic) solutions.32