Why Does the Pink Color in a Titration Fade Over Time? - Physics …
Jan 31, 2005 · In summary, the pink color obtained from the 2-3 phenolphthalein indicator at the end point of the titration gradually disappears over time due to the absorption of CO2 from the air, which produces the weak acid HCOOOH. This results in a drop in pH and the color of phenolphthalein is dependent on the pH of the solution.
Aurora Forecast - Geophysical Institute
4 days ago · The aurora is most often seen as a striking green, but it also occasionally shows off other colors, ranging from red to pink or blue to purple. Oxygen at about 60 miles up gives off the familiar green-yellow color, while oxygen at higher altitudes (about 200 miles above Earth’s surface) gives all-red auroras.
What do the blue and pink color of the rust indicator shown mean?
Oct 12, 2014 · What do the blue and pink color the rust indicator shown mean? Let say, the mixture of potassium hexacyanoferrate(III) and phenolphthalein is the rust indicator. And we use to detect the rusting of an iron nail. And the result is: the tip, head region of the nail appear blue color; the straight region appears pink color.
HDMI cable wiring schematic (what colors go where) - Physics …
Jun 12, 2010 · The cable comes in and of course is no good, the HDMI connector basically fell apart when I plugged it in. So I am going to try and make it work, by sodering the cables to the conector. My problem is I don't know which color goes where on the actual HDMI connector. There are 8 wires (Black, Blue, Red, Brown, White, Pink, Dark Green and Light ...
Why does a Walrus Blush? - Geophysical Institute
Dec 19, 2024 · Various investigators have suggested that the circulation in the skin and hind flippers of pinnipeds plays an important role in maintaining the animal's thermal equilibrium. The skin of walruses becomes pallid when it is exposed to cold air or water and changes to pink when exposed to warmer ambient temperatures.
Are there green, purple and pink stars? - Physics Forums
Nov 23, 2009 · Green, purple, and pink stars are usually a combination of these temperatures, resulting in a mix of colors that our eyes perceive as green, purple, or pink. How rare are green, purple, and pink stars? Green, purple, and pink stars are considered to be relatively rare, as they are not as common as blue, white, or red stars.
Sodium vapor lamps - how do they work - Physics Forums
Aug 30, 2005 · I don't quite understand the explanation at wiki; when the lamp is turned on it emits a dim red/pink light to warm the sodium metal and within a few minutes it turns into the common bright orange/yellow color as the sodium metal vaporizes. What does this mean (the vaporizes bit)? the sodium...
Plasma Color: What Makes It Blue & What Colors It Can Be?
Jan 6, 2011 · Depends on the lamp. Incandescents - while don't contain plasma - emit the light just because wire is hot. In gas discharge lamps atoms (or molecules) get excited by collisions with electrons or other ions/atoms that were accelerated by the electric field between electrodes, then they emit photons when falling back to lower energy states.
Why can centripetal force balance out gravity? - Physics Forums
Jun 19, 2023 · Here is the figure for my question. The object is doing uniform circular motion around the gray circle that is in a plane parallel to the ground, the pink force F_combined is the combination of the two red force G (gravity) and F_c (centripetal force), so the pink force will always point downwards, meaning that the object will always move down, but why can the …
Why does my Patton-Reeder indicator immediately turn blue?
Dec 13, 2019 · So I made a new solution, adjusted to pH 12, and this time it turned pink. I added the EDTA, then it turned blue. No idea what went wrong the first time, maybe too much indicator so the pink looked purple / blue. Anyway, now back on track! Thanks Borek, otherwise I would have ended up with some concoction of magnesium, potassium, sodium etc etc.