No ke aha i ʻoi aku ka wikiwiki o ka pane ʻana o Si a me NaOH ma mua o SiO2?

No ke aha i ka helu pane osilikaa ʻo ka sodium hydroxide hiki ke ʻoi aku ma mua o ka silicon dioxide hiki ke nānā ʻia mai kēia mau ʻaoʻao:

ʻokoʻa i ka ikehu pili kemika

▪ Ka hopena o ke kilikakona a me ka sodium hydroxide: Ke hoʻopili ʻia ke silikona me ka sodium hydroxide, ʻo ka ikehu hoʻopaʻa Si-Si ma waena o nā ʻātoma silikona he 176kJ/mol wale nō. Haʻi ka paʻa Si-Si i ka wā o ka hopena, ʻoi aku ka maʻalahi o ka haki. Mai ka manaʻo kinetic, ʻoi aku ka maʻalahi o ka hoʻomau.

▪ Ka hopena o ka silicon dioxide a me ka sodium hydroxide: ʻO ka ikehu paʻa Si-O ma waena o nā ʻātoma silika a me nā ʻātoma oxygen i loko o ka silicon dioxide he 460kJ/mol, he mea kiʻekiʻe. Pono ka ikehu kiʻekiʻe e uhaʻi i ka paʻa Si-O i ka wā o ka pane ʻana, no laila paʻakikī ka hana ʻana a ua lohi ka pane.

ʻO nā ʻano hana hoʻonā like ʻole

▪ Hoʻopili ka silikino me ka sodium hydroxide: Hoʻopili mua ʻo Silicon me ka sodium hydroxide ma ka hana ʻana me ka wai e hoʻohua i ka hydrogen a me ka waikawa silicic, a laila hoʻopili ka ʻakika silicic me ka sodium hydroxide e hoʻohua ai i ka sodium silicate a me ka wai. I loko o kēia pane ʻana, hoʻokuʻu ka wela ma waena o ke silika a me ka wai, hiki ke hoʻoikaika i ka neʻe ʻana o ka molekala, a laila e hoʻokumu i kahi ʻano kinetic maikaʻi loa no ka hopena a me ka wikiwiki o ka hopena.

▪ Hoʻopili ka silikika dioxide me ka sodium hydroxide: Hoʻopili mua ʻo Silicon dioxide me ka sodium hydroxide ma ka hana ʻana me ka wai e hoʻohua ai i ka ʻakika silicic, a laila hui pū ka waikawa silicic me ka sodium hydroxide e hana ai i ka sodium silicate. He lohi loa ka hopena ma waena o ka silicon dioxide a me ka wai, a ʻaʻole hoʻokuʻu ka wela i ke kaʻina hana. Mai ka hiʻohiʻona kinetic, ʻaʻole kūpono ia i ka hopena wikiwiki.

Nā hale hana ʻokoʻa

▪ Hoʻolālā silikoni:SilikaLoaʻa iā ia kekahi ʻano aniani, a aia kekahi mau āpau a me nā pilina palupalu ma waena o nā ʻātoma, e maʻalahi ai ka hoʻopili ʻana a me ka hoʻopili ʻana o ka solution sodium hydroxide me nā ʻātoma silika.

▪ Kapili osilikadioxide:silikaʻO ka dioxide kahi hoʻolālā spatial network paʻa.Silikanā ʻātoma a me nā ʻātoma oxygen ua paʻa paʻa ʻia e nā kaula covalent e hana i kahi ʻano aniani paʻa a paʻa. He mea paʻakikī ke komo ʻana o ka solution sodium hydroxide i loko o kona loko a hoʻopili piha i nā ʻātoma silicon, e hopena i ka paʻakikī i ka hopena wikiwiki. ʻO nā ʻātoma silika wale nō ma ka ʻili o nā ʻāpana silika dioxide hiki ke hana me ka sodium hydroxide, e kaupalena ana i ka helu pane.

Ka hopena o nā kūlana

▪ Ka hopena o ke silikona me ka sodium hydroxide: Ma lalo o nā kūlana hoʻomehana, e hoʻokē nui ʻia ka wikiwiki o ka hopena o ke silikona me ka solution sodium hydroxide, a hiki i ka hopena ke holo mālie i nā wela kiʻekiʻe.

▪ Ka hopena o ke silicon dioxide me ka sodium hydroxide: He lohi loa ka hopena o ke silicon dioxide me ka solution sodium hydroxide i ka wela lumi. ʻO ka maʻamau, e hoʻomaikaʻi ʻia ka nui o ka hopena ma lalo o nā kūlana koʻikoʻi e like me ka wela kiʻekiʻe a me ka solution sodium hydroxide concentrated.