Click for money

Saturday, February 1, 2014

Hot and Cold Valentine Chemistry Demonstration


Try the hot and cold Valentine's Day science demonstration. (Getty Images)
Here's a fun and easy Valentine's Day chemistry demonstration. Take a pink liquid, heat it up and watch it turn colorless. Upon cooling, the color of the liquid will return to pink. Here's what you do:

Prepare the Hot and Cold Valentine Solution

Add a few drops of phenolphthalein indicator and a drop of concentrated ammonia to 500 ml of water in a beaker, flask or large test tube.

Perform the Valentine's Day Demo

Present the pink solution. You can heat the liquid over a hot plate or, in the case of the test tube, in a burner flame. Heating the solution causes a shift in the equilibrium between the unionized ammonia and the ionized ammonium hydroxide. The change in pH makes the pink-colored indicator turn colorless. If you do not experience a color change, there is too much ammonia in the solution, so dilute it further with water and try again.

No comments:

Post a Comment

সরকারি খরচে প্রশিক্ষণ পাবে পাঁচ লাখ তরুণ

তথ্য ও যোগাযোগ প্রযুক্তি -নির্মাণশিল্প -লাইট -ইঞ্জিনিয়ারিং -জাহাজ নির্মাণ শিল্প -চামড়া ও পাদুকাশিল্প -ট্যুরিজম অ্যান্ড হসপিটালিটি: অ্যাগ্...

Popular posts