2. The identification A student knew tion labels fell off three test tubes, each

Question

2. The identification A student knew tion labels fell off three test tubes, each contalning a colories solut fell that one of the the third contained 01% solution, the student temmporarily iabeled the test another contalned 0.1M NaOH solution, and The st tubes"A ", "B, and "C solutions in arnous combinations, recording all observations in the table below ) I drop "A +1 drop "B 2) solution from (1)+ 1 drop "C (3) solution from (2)+1 drop "B elservations red solution solution became colorless solution turned red Determine which original label should be attached to each of the test tubes. 3. Even people who are not familiar with the study of chemistry use the expression, "the li when referring to a test that produces an unquestionable result. On the basis of your experi results, can you concludethit using litmus paper provides a "li tmus test,

Explanation / Answer

1. 1 drop of A + 1 drop of B gives red colour which shows that the solution is alkaline in nature. That means either of A or B is a Base in solution 1. Further to it when more of C is added , the olution becomes colourless , that means that the base due to which red colour was there has been neautralised by C , hence C is an Acid HCl. To solution 2 when more of B is added the solution turns red indicating that B is base NaOH. A is phenolphthalein.

2. Litmus is a weakly acidic, colored organic dye in which simple pH scale ranges from 0-14 with 7 being neutral at 25 oC. Numbers less than 7 are considered to be acidic and gives red colour on the litmus paper, and numbers greater than 7 are considered basic giving blue colour on the litmus paper. If a red litmus turns blue when treated with a base and do not turns for a neutral and an acidic medium. Similarly a blue litmus turns red when treated with a basic solution but do not turns for a neutral or basic medium. A litmus paper will not give any test if the ions are not free i.e. are not dissociated, they need to be in an aqueous solution

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