Mienzaniso yeMibvunzo Inokurukura Simba reAcids neBases
Simba reasidhi nebase ipfungwa dzakakosha mukemistri dzinoratidza kuti acid kana base molecule inogona sei kupa proton (H⁺) kana kugamuchira proton, zvichiteerana. Muhurukuro iyi, tichatarisa mienzaniso yakati wandei yezvinetso zvinotibatsira kunzwisisa acid nebase strength, pamwe nekuverenga pH nepOH yavo. Tisati tapinda muhurukuro dzezvinetso, ngatitangei tanzwisisa hwaro hweacid nebase theory.
Nhanganyaya kuSimba reAcids neBases
Simba reasidhi kana hwaro rinogona kutsanangurwa nedanho rayo reionization mumhinduro. Asidhi yakasimba inongova inenge yasanganiswa zvachose mumhinduro, nepo asidhi isina simba ichingova yasanganiswa zvishoma chete. Izvi ndizvo zvinoitikawo kumabhesi.
Acids Dzakasimba uye Acids Dzisina Simba
Asidhi akasimba, akadai se:
– Hydrochloric acid (HCl)
– Sulfuric acid (H₂SO₄)
– Nitric acid (HNO₃)
Inenge yanyatsosanganiswa ne ion mu solution. Semuenzaniso, HCl mumvura inopatsanurwa kuita H⁺ uye Cl⁻ inenge yanyatsosanganiswa zvachose.
Asidhi dzisina simba, dzakadai se:
– Acetic acid (CH₃COOH)
– Hydrofluoric acid (HF)
– Citric acid (C₆H₈O₇)
inongoiswa ion zvishoma mumushonga. Izvi zvinoreva kuti chero nguva, mamwe mamorekuru easidhi anoramba ari muchimiro chemamorekuru uye haaparadzani kuita maion.
Mabhesi Akasimba uye Mabhesi Asina Simba
Nheyo dzakasimba, dzakadai se:
- Sodium hydroxide (NaOH)
– Potassium hydroxide (KOH)
– Calcium hydroxide (Ca(OH)₂)
Inenge yanyatsosanganiswa nemvura, zvichiburitsa huwandu hwakawanda hweOH⁻ ions.
Zvigadziko zvisina kusimba, zvakaita se:
– Amoniya (NH₃)
– Methylamine (CH₃NH₂)
Inongoerekana yava ioni muchikamu chemvura, ichiburitsa huwandu hushoma hweOH⁻ ions.
Mibvunzo yemuenzaniso nekukurukurirana
Ngatiedzei mimwe mienzaniso yezvinetso kuti tinzwisise zviri nani pfungwa iyi.
Muenzaniso Mubvunzo 1: Kuverenga pH yeAcid Yakasimba
Mubvunzo:
Verenga pH ye 0,1 M HCl solution.
Kukurukurirana:
HCl iasidhi yakasimba, saka inozoisa ioni zvizere mumushonga:
\[ \text{HCl} \rightarrow \text{H}^+ + \text{Cl}^- \]
Sezvo HCl yazara ionized, huwandu hwe [H⁺] hwakaenzana nehuwandu hweHCl:
\[ [\text{H}^+] = 0,1 \, \text{M} \]
\[ \text{pH} = -\log[\text{H}^+] \]
\[ \mashoko{pH} = -\log(0,1) \]
\[ \mashoko{pH} = 1 \]
Saka, pH ye 0,1 M HCl solution i1.
Muenzaniso Mubvunzo 2: Kuverenga pH yeAcid Isina Simba
Mubvunzo:
Verenga pH ye 0,1 M CH₃COOH solution. Zvinozivikanwa kuti Ka (acid dissociation constant) ye CH₃COOH ndeye \(1,8 \times 10^{-5}\).
Kukurukurirana:
Kune maasidhi asina simba, mwero weionization unofanira kutariswa. Equation yekuenzana kwekupatsanurwa kweacetic acid ndeiyi:
\[ \text{CH}_3\text{COOH} \rightleftharpoons \text{H}^+ + \text{CH}_3\text{COO}^- \]
Nekushandisa Ka:
\[ \text{Ka} = \frac{[\text{H}^+][\text{CH}_3\text{COO}^-]}{[\text{CH}_3\text{COOH}]} \]
Ngatitii kupatsanurwa [H⁺] = [CH₃COO⁻] = x uye yekutanga [CH₃COOH] iri 0,1 M, wobva wa:
\[ 1,8 \kawa 10^{-5} = \frac{x^2}{0,1 – x} \]
Sezvo Ka ari mudiki, x inogona kuregeredzwa zvichienzaniswa ne 0,1:
\[ 1,8 \kawa 10^{-5} \approx \frac{x^2}{0,1} \]
\[ x^2 = 1,8 \kawa 10^{-6} \]
\[ x = \sqrt{1,8 \kawa 10^{-6}} \]
\[ x \inenge 1,34 \kawa 10^{-3} \]
Zvadaro, [H⁺] ≈ \(1,34 \times 10^{-3} \):
\[ \text{pH} = -\log[\text{H}^+] \]
\[ \text{pH} = -\log(1,34 \times 10^{-3}) \]
\[ \text{pH} \inenge 2,87 \]
Saka, pH ye 0,1 M CH₃COOH solution inenge 2,87.
Muenzaniso Mubvunzo 3: Kuverenga pOH ne pH yeMabhesi Akasimba
Mubvunzo:
Verenga pOH ne pH ye 0,01 M NaOH solution.
Kukurukurirana:
NaOH ihwaro hwakasimba hwakanyatsoiswa ion mumvura:
\[ \text{NaOH} \rightarrow \text{Na}^+ + \text{OH}^- \]
Sezvo NaOH yakazara ionized, huwandu hwe [OH⁻] hwakaenzana nehuwandu hweNaOH:
\[ [\text{OH}^-] = 0,01 \, \text{M} \]
\[ \text{pOH} = -\log[\text{OH}^-] \]
\[ \text{pOH} = -\log(0,01) \]
\[ \mashoko{pOH} = 2 \]
Zvinozivikanwa kuti pH ne pOH zvakabatana kuburikidza ne equation:
\[ \text{pH} + \text{pOH} = 14 \]
Saka,
\[ \text{pH} = 14 – \text{pOH} \]
\[ \mashoko{pH} = 14 – 2 \]
\[ \mashoko{pH} = 12 \]
Saka, pOH ye 0,01 M NaOH solution i2, uye pH i12.
Muenzaniso Mubvunzo 4: Kuverenga pH yeWeak Base
Mubvunzo:
Verenga pH ye 0,1 M NH₃ solution. Zvinozivikanwa kuti Kb (base dissociation constant) yeNH₃ ndeye \(1,76 \times 10^{-5}\).
Kukurukurirana:
NH₃ mumvura inoita kuti pave neNH₄⁺ uye OH⁻:
\[ \text{NH}_3 + \text{H}_2\text{O} \rightleftharpoons \text{NH}_4^+ + \text{OH}^- \]
Nekushandisa Kb,
\[ \text{Kb} = \frac{[\text{NH}_4^+][\text{OH}^-]}{[\text{NH}_3]} \]
Ngatitii kupatsanurwa [OH⁻] = [NH₄⁺] = x, uye yekutanga [NH₃] iri 0,1 M, wobva wati:
\[ 1,76 \kawa 10^{-5} = \frac{x^2}{0,1 – x} \]
Sekufunga, x idiki zvishoma kana tichienzanisa ne 0,1:
\[ 1,76 \kawa 10^{-5} \approx \frac{x^2}{0,1} \]
\[ x^2 = 1,76 \kawa 10^{-6} \]
\[ x = \sqrt{1,76 \kawa 10^{-6}} \]
\[ x \inenge 1,33 \kawa 10^{-3} \]
Zvadaro, [OH⁻] ≈ \(1,33 \times 10^{-3}\):
\[ \text{pOH} = -\log[\text{OH}^-] \]
\[ \text{pOH} = -\log(1,33 \times 10^{-3}) \]
\[ \text{pOH} \inenge 2,88 \]
Zvadaro, pH inoverengerwa ne:
\[ \text{pH} = 14 – \text{pOH} \]
\[ \mashoko{pH} = 14 – 2,88 \]
\[ \text{pH} \inenge 11,12 \]
Saka, pH ye 0,1 M NH₃ solution inenge 11,12.
Mhedziso
Kunzwisisa simba remaacid nemabhesi kwakakosha mukemistri. Nekunzwisisa maverengero epH nepOH, uye kuziva mawaniro ekuona maacid nemabhesi asina simba uye akasimba, uchagadzirira zviri nani kugadzirisa matambudziko akasiyana-siyana ekemistri ane chekuita nemhinduro. Mienzaniso yakapihwa inotarisirwa kujekesa pfungwa idzi uye kupa hwaro hwakasimba hwekudzidza zvakawanda.
