Qualification > Sciences
Chemistry doubt
Ghost Of Highbury:
--- Quote from: 8T on May 24, 2010, 06:50:01 pm ---hi By the way below copper theres mercury Hg
i have a question mj 04 p1 q 30
why is the answer C?
can sum1 explain plz
--- End quote ---
the original is dilute NaOH because it has water in it...so say its pH is 10 (>7, because its alkali)
the distillate is water so pH = 7
the NaOH in the flask doesnt have any water left, so its concentrates that means its pH >10 (dilute NaOH)
thus , C
rhea:
hey can you tell me what colour chnages occur when universal indicator comes in contact with
hydrogen
oxygen
ammonia
and i thought acid /salt added to UI would not change the colour of UI.
right?
8T:
UI in neutral solutions is green
in alkali blue if weak, violet if strong
in acid red & u do not test for gases with UI
Thanks A@di :)
Vin:
--- Quote from: rhea on May 24, 2010, 07:05:05 pm ---hey can you tell me what colour chnages occur when universal indicator comes in contact with
hydrogen
oxygen
ammonia
and i thought acid /salt added to UI would not change the colour of UI.
right?
--- End quote ---
hydrogen - no change
oxygen - no change
ammonia - blue/purple
yes it does .. right click and click view image
rhea:
--- Quote from: ~VIN1094~ on May 24, 2010, 07:17:12 pm ---hydrogen - no change
oxygen - no change
ammonia - blue/purple
yes it does .. right click and click view image
--- End quote ---
umm this means phenolphthalein is not an UI?
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