Question

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 ?​

Answer 1

(i) Put the red litmus paper in all the test tubes, turn by turn. The solution which turns red litmus to blue will be a basic solution. The blue litmus paper formed here can now be used to test the acidic solution.

(ii) Put the blue litmus paper obtained above in the remaining two test-tubes, turn-by-turn. The solution which turns the blue litmus paper to red will be the acidic solution.

(iii) The solution which has no effect on any litmus paper will be neutral and hence it will be distilled 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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