Mienzaniso yeMibvunzo Kukurukura nezve pH yeStrong Acids neStrong Bases
pH, kana kuti kugona kwehydrogen, chiyero cheacidity kana alkalinity yemushonga. Chikero chepH chinotangira pa0 kusvika pa14, nhamba dziri pasi pe7 dzichiratidza mhinduro ine acidic, nhamba dziri pamusoro pe7 dzichiratidza mhinduro yekutanga, uye 7 dzichiratidza mhinduro isina neutral. Muchinyorwa chino, tichakurukura mienzaniso yakati wandei yematambudziko maererano nepH yeasidhi yakasimba uye mabhesi akasimba, pamwe chete nemhinduro dzayo.
Pendauluan
Pfungwa huru dze pH
pH chiyero chinoshandiswa kuona acidity kana alkalinity yemushonga zvichibva pakuwanda kwemahydrogen ions (H+). Fomura yekutanga yekuverenga pH ndeiyi:
\[ \text{pH} = -\log{[H^+]} \]
Apo [H+] iri huwandu hwehydrogen ion mu mol/L.
Kune rumwe rutivi, kune mhinduro dzekutanga (zvigadziko zvakasimba), tinogona kutanga taverenga pOH tobva tashandura kuita pH tichishandisa fomura inotevera:
\[ \text{pOH} = -\log{[OH^-]} \]
\[ \text{pH} = 14 – \text{pOH} \]
Asidhi Yakasimba vs Asidhi Isina Simba
Asidhi yakasimba iasidhi inonyungudika zvizere mumvura. Izvi zvinoreva kuti huwandu hweH+ ions mumhinduro hwakaenzana nehuwandu hweasidhi pachayo. Mienzaniso yeasidhi yakasimba ndeiyi HCl (hydrochloric acid), HNO3 (nitric acid), uye H2SO4 (sulfuric acid).
Kusiyana neizvi, maasidhi asina simba haaite ioni zvachose mumushonga, saka kuverenga kwavo pH kwakaoma uye kunoda pfungwa yeacidity constant (Ka).
Nheyo Yakasimba vs Nheyo Isina Simba
Kufanana nemaasidhi akasimba, mabhesi akasimba anochinja zvachose mumvura ine mvura. Mienzaniso yemabhesi akasimba ndeiyi NaOH (sodium hydroxide) uye KOH (potassium hydroxide).
Mabhesi asina simba anongoshandiswa zvishoma chete uye anoda pfungwa yechinhu chinoramba chiripo (Kb) kuti paverengwe pH.
Mibvunzo yemuenzaniso nekukurukurirana
Muenzaniso Mubvunzo 1: Asidhi Yakasimba
> Verenga pH ye 0.01 M HCl solution.
Kukurukurirana:
Sezvo HCl iri acid yakasimba, inozonyungudika zvachose mumushonga.
\[ \text{HCl} \rightarrow \text{H}^+ + \text{Cl}^- \]
Kuwanda kwemaion eH+ mumushonga kuchafanana nekuwanda kweHCl kwakapihwa, kureva 0.01 M.
\[ [H^+] = 0.01 \, \mashoko{M} \]
Kushandisa fomura ye pH:
\[ \text{pH} = -\log{[H^+]} = -\log{0.01} = -\log{10^{-2}} = 2 \]
Saka, pH ye 0.01 M HCl solution i2.
Muenzaniso Mubvunzo 2: Nheyo Dzakasimba
> Verenga pH ye 0.001 M NaOH solution.
Kukurukurirana:
NaOH ihwaro hwakasimba uye huchanyatsoita ioni mumushonga.
\[ \text{NaOH} \rightarrow \text{Na}^+ + \text{OH}^- \]
Kuwanda kwemaOH-ions mumushonga kwakafanana nekuwanda kweNaOH, kureva 0.001 M.
\[ [OH^-] = 0.001 \, \text{M} = 10^{-3} \, \text{M} \]
Verenga pOH kutanga:
\[ \text{pOH} = -\log[OH^-] = -\log{10^{-3}} = 3 \]
Shandura pOH kuita pH:
\[ \text{pH} = 14 – \text{pOH} = 14 – 3 = 11 \]
Saka, pH ye 0.001 M NaOH solution i11.
Muenzaniso Mubvunzo 3: Sulfuric Acid (H2SO4)
> Verenga pH ye 0.01 M H2SO4 solution.
Kukurukurirana:
H2SO4 iasidhi yakasimba ine matanho maviri eionization. Danho rekutanga:
\[ \text{H2SO4} \rightarrow \text{H}^+ + \text{HSO4}^- \]
Mhedzisiro ye ionization yedanho rekutanga yakaenzana nehuwandu hweH2SO4 hwe0.01 M paH+ imwe neimwe neHSO4^-. Zvisinei, danho rekutanga rinoburitsa maH+ ions maviri kubva kumorekuru imwe chete yeH2SO4.
Saka, huwandu hwese hwe [H+] huchapetwa kaviri kupfuura huwandu hwekutanga:
\[ [H^+] = 2 \kawa 0.01 = 0.02 \]
Kushandisa fomura ye pH:
\[ \text{pH} = -\log{[H^+]} = -\log{0.02} = -\log{2 \times 10^{-2}} = -(\log{2} + \log{10^{-2}}) \]
Kuti uwane ruzivo,
\[ \log{2} \inenge 0.301 \]
Saka:
\[ \text{pH} = -(0.301 + (-2)) = 1.699 \]
Saka, pH ye 0.01 M H2SO4 solution inenge 1.699.
Muenzaniso Mubvunzo 4: Hwaro Hwakasimba (Ca(OH)2)
> Verenga pH ye 0.005 M Ca(OH)2 solution.
Kukurukurirana:
Ca(OH)2 ihwaro hwakasimba uye molekyuru yega yega inopa maOH-ion maviri:
\[ \text{Ca(OH)2} \rightarrow \text{Ca}^{2+} + 2\text{OH}^- \]
Kuwanda kweOH- kuchave kaviri kuwanda kweCa(OH)2 nekuti molekyuru yega yega yeCa(OH)2 inoburitsa maOH- maviri. Saka,
\[ [OH^-] = 2 \kawa 0.005 = 0.01 \, \text{M} \]
Verenga pOH kutanga:
\[ \text{pOH} = -\log{[OH^-]} = -\log{0.01} = -\log{10^{-2}} = 2 \]
Shandura pOH kuita pH:
\[ \text{pH} = 14 – \text{pOH} = 14 – 2 = 12 \]
Saka, pH ye 0.005 M Ca(OH)2 solution i12.
Mhedziso
Muchinyorwa chino, takurukura maverengero epH yemienzaniso yakati wandei yemhinduro dzeasidhi yakasimba nebase yakasimba. Yeuka kuti kune maasidhi akasimba kana mabase, tinofunga kuti akazara neionized mumhinduro. Nokudaro, huwandu hweH+ ions yeasidhi yakasimba neOH- ions yebase yakasimba huchaenzana nehuwandu hwekutanga hweasidhi kana base, mushure mekugadzirisa zvinhu zvestoichiometric kana zvichidikanwa. Izvi zvinoita kuti kuverenga kwepH kuve nyore uchishandisa maformula ekutanga epH nepOH.
Kunzwisisa pfungwa iyi kwakakosha, kunyanya mukushandiswa kwemakemikari, kungave murabhoritari yemakemikari, muindasitiri, kana muhupenyu hwezuva nezuva. Nekudzidzira uye kunzwisisa kwakasimba, kuverenga pH yeasidhi yakasimba nemabhesi kuchava basa riri nyore.
