blunt essays with sharp points
Jun 16, 2012 11:40 AM–Bicarbonate gets its name from how it combines with metal atoms, compared to carbonate.
A bicarbonate is a carbonate with a hydrogen atom attached. The hydrogen atom’s one positive electrical charge leaves the carbonate with only one of its two negative electrical charges free.
For example, one carbonate can capture two atoms of a metal, if each metal atom has one positive charge. But it takes two bicarbonates to capture the same two metal atoms. You end up with twice the number of carbonates combined with the same number of metal atoms. Thus the name: bi- (meaning two) carbonate.
You can think of the second carbonate as diluting the metal further, and this is how it often works in practice. For example, washing soda is the carbonate of sodium, and baking soda is the bicarbonate. Because there is more carbonate diluting the sodium in baking soda than in washing soda, the baking soda is weaker.¹
In 19th century writings, you will also find the less precise name “supercarbonate”: super- (meaning above, or higher than normal) carbonate.
In the 21st century, the preferred more precise name is “hydrogen carbonate”. Chemists also prefer to use the pure metal name, such as “sodium” instead of “soda”, because “soda” has multiple meanings.
For example: in old Irish soda bread recipes you will see “supercarbonate of soda”, but on the box of baking soda you will see “sodium bicarbonate” and in modern chemistry books you will see “sodium hydrogen carbonate” – all meaning the same compound.
1. In chemical notation:
2 Na⁺ + 1 CO₃²⁻ → 1 Na₂CO₃ (sodium carbonate, washing soda)
2 Na⁺ + 2 HCO₃¹⁻ → 2 NaHCO₃, (sodium hydrogen carbonate, baking soda)
Labels: atoms, baking soda, bicarbonate, carbonate, charge, chemical equation, chemical formula, chemical notation, chemistry, etymology, hydrogen, metal, nomenclature, soda, sodium, supercarbonate, washing soda, word origin(go to complete article)
Jun 4, 2012 6:00 AM–Before Google, if you had a Windows PC problem, you followed Microsoft’s Four “R”s to solve it:
- Restart the app
- Reboot Windows
- Reload the software
- Replace the PC
Google’s innovation in this space is to add another “R”:
- Refresh the tab
Finish each day and be done with it. You have done what you could. Tomorrow is a new day; begin it well and serenely and with too high a spirit to be encumbered with your old nonsense. —Ralph Waldo Emerson
Sometimes they fool you by walking upright.
What part of “Ph’nglui mglw’nafh Cthulhu R’lyeh wgah’nagl fhtagn” don’t you understand?
Build a man a fire, and he’ll be warm for a day. Set a man on fire, and he’ll be warm for the rest of his life. —Terry Pratchett
Never try to teach a pig to sing; it wastes your time and it annoys the pig. —Robert Heinlein
Do not ask why the past was better than the present, for this is not a question prompted by wisdom. —Ecclesiastes 7:10
Power lines abruptly stopped causing cancer in 1997 after the U.S. National Cancer Institute conducted a better study. —Robert Parks
Встретимся под столом! (Vstretimsja pod stolom: To meeting you under the table!)
The more you cry, the less you’ll pee.
Relish the love of a good woman.
It’ll never get better if you keep picking at it. —advice from Judge “Maximum” Bob Gibbs