Question

1.
You have been provided with three test tubes. One of them contains
distilled water and the other two contain an acidic solution and a basic
solution, respectively. If you are given only red litmus paper, how will
you identify the contents of each test tube?


Add few drops of solution from all three test tubes on the red litmus paper separately. The solution which turns red litmus to blue contains basic solution. Use the blue litmus papers to test the solutions in other two test tubes. The solution for the test tube which turn blue litmus paper to red will be the acidic solution and solution of the test tube which do not change either red or blue litmus papers contains water ​

Answer 1

Add few drops of solution from all three test tubes 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 test tubes. The solution from the test tube which turns blue litmus paper to red will be the acidic solution and solution of the test tube which do not change either red or blue litmus paper contain water.

Answer 2

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Dɪᴘ ᴛʜᴇ ʀᴇᴅ ʟɪᴛᴍᴜs ᴘᴀᴘᴇʀ ɪɴ ᴏɴᴇ ᴏғ ᴛʜᴇ ᴛᴇsᴛ ᴛᴜʙᴇs, ɪғ ᴛʜᴇ ᴄᴏʟᴏᴜʀ ᴏғ ᴛʜᴇ ᴘᴀᴘᴇʀ ᴅᴏᴇs ɴᴏᴛ ᴄʜᴀɴɢᴇ, ᴛʜᴇɴ ɪᴛ ɪs ᴀɴ ᴀᴄɪᴅ. Iғ ᴛʜᴇ ᴄᴏʟᴏᴜʀ ᴏғ ʀᴇᴅ ʟɪᴛᴍᴜs ᴄʜᴀɴɢᴇs ᴛᴏ ʙʟᴜᴇ ᴛʜᴇɴ ɪᴛ ɪs ᴀ ʙᴀsᴇ. Iғ ᴛʜᴇʀᴇ ɪs ᴀ sʟɪɢʜᴛ ᴄʜᴀɴɢᴇ ɪɴ ᴛʜᴇ ᴄᴏʟᴏᴜʀ ᴏғ ʀᴇᴅ ʟɪᴛᴍᴜs (sᴜᴄʜ ᴀs ᴘᴜʀᴘʟᴇ) ᴛʜᴇɴ ɪᴛ ɪs ᴅɪsᴛɪʟʟᴇᴅ ᴡᴀᴛᴇʀ.

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