Question

Sam has 3 beakers A , B and C . but unfortunately he forgot to label them. Now how will Sam find out using a litmus paper which beaker contains acidic drink​

Answer 1

Add few drops of solution from all three beakers on the red litmus paper separately. The solution which turns red litmus to blue contains basic solution. Use this blue litmus paper to test the solutions in other two beakers. The solution from the beaker which turns blue litmus paper to red will be the acidic solution and solution of the beaker which do not change either red or blue litmus paper contain water.