Ngwaahịa

Buffer bụ ihe ngwọta nke nwere ike iguzogide mgbanwe pH mgbe agbakwunyere obere acid ma ọ bụ alkali na mmiri.Sistemụ nchekwa pH na-arụ ọrụ dị mkpa n'ịkwado uru pH nkịtị nke ihe ndị dị ndụ na gburugburu physiological nkịtị.Ọtụtụ sel nwere ike ịrụ ọrụ naanị n'ụdị pH dị warara.Ọ kwesịrị ịnwe usoro nchekwa iji guzogide mgbanwe pH nke na-eme n'oge metabolism.Enwere sistemu pH buffer atọ dị na organism, ha bụ protein na sistemụ nchekwa bicarbonate.Ọnụ ego nke sistemu nchekwa ọ bụla Ọ dị iche na ụdị sel na akụkụ dị iche iche.

Mmetụta nchikota nke ihe nkpuchi buffer nke nwere acid HA na-adịghị ike na nnu NaA na acid bụ n'ihi ọnụnọ nke oke alkali A- na ngwọta.Mgbe agbakwunyere ntakịrị acid siri ike na ngwọta a, A-ion na-eri H ion:

Ya mere, uru pH nke ngwọta fọrọ nke nta ka ọ ghara ịgbanwe;mgbe agbakwunyere ụfọdụ isi siri ike, acid HA na-adịghị ike na ngwọta na-eri OH-ions ma na-egbochi mgbanwe nke pH.

Tinye obere acid siri ike ma ọ bụ ntọala siri ike na ngwọta nchekwa, uru pH nke ngwọta ahụ agaghị agbanwe nke ukwuu, ma ọ bụrụ na agbakwunyere acid ma ọ bụ alkali, ihe ngwọta nke nchekwa ga-efunahụ mmetụta nkwụsị ya.Nke a na-egosi na ikike nchekwa ya nwere oke.

Ikike nchekwa nke ihe nkpuchi na-ejikọta ya na ntinye nke ihe ndị mejupụtara ngwọta nchekwa.Ngwọta nchekwa nke mejupụtara 0.1mol·L-1HAc na 0.1mol·L-1NaAc nwere ikike nchekwa dị ukwuu karịa ihe nchekwa nchekwa nke 0.01mol·L-1HAc na 0.01mol·L-1NaAc.Enwere ike ịkwado nke a site na mgbako.Otú ọ dị, ntinye nke akụkụ nke ngwọta nchekwa ekwesịghị ịdị ukwuu, ma ọ bụghị ya, a pụghị ileghara mmekọrịta dị n'etiti ions anya.