Question

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

Answer 1

Answer:

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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