|WikiProject Chemistry||(Rated C-class, Mid-importance)|
Hi, I am Rajasekhar from India. could u please guide me to learn about the "powder/paste that melts the rocks/stones which said to have been invented by south asia/china/japan widely uses particularily in mines and quarees in order to melt the stones/rocks instead of blasting and explosions. waiting for ur reply. Thank You.
N.B: Please mail me to "firstname.lastname@example.org"
query about some chemicals
4.China Paste otherwise called rock melting paste said to have been invented by chinese
to melt the rocks/stones at mines or quareese.
Ben 13:46, 21 March 2007 (UTC)
Carboxylic acid = strong acid?
I'm not quite sure carboxylic acids are all strong acids. I'd think of them as weak acids, with the conjugate salts being relatively strong bases. --Rifleman 82 02:14, 28 March 2007 (UTC)
Hydrocarbons are acids
- That's would be a misleading statement, even though it contains a grain of truth. Most hydrocarbons are not very acidic. They don't neutralise most bases. We could go into a long discussion about how easily various hydrocarbons can be deprotonated and so on, but it would be a distraction. Almost any molecule can be depronated (given a strong enough base like BuLi) but we only call them acids if they are deprotonated fairly easily by normal-strength bases like NaOH. If you mix acetic acid and sodium hydroxide, a salt forms, sodium acetate. If you mix hexane with NaOH, nothing happens. That's why we say acetic acid is an acid but hexane isn't. --Ben (talk) 13:31, 10 January 2012 (UTC)
- Again, acetylene is not what we'd normally refer to as an acid, because it takes very strong bases like BuLi to deprotonate it. The pKa of alkynes is about 25, compared to 16 or so for alcohols, 14 for water, 10 for phenols, 5 for carboxylic acids and about 0 for mineral acids like HCl. This means an alkyne is about a billion times less acidic than an alcohol, which itself is not very acidic (ethanol, for example, is not going to burn a hole in your trousers, whereas HCl will). Acetylene is much more acidic than alkanes, but much less acidic than proper acids. That's why we don't call it an acid - it only donates protons to über powerful bases. --Ben (talk) 20:00, 20 February 2012 (UTC)
- Meldrum's acid? Whoop whoop pull up Bitching Betty | Averted crashes 04:21, 22 February 2012 (UTC)