Constante de basicidade

Ácidos e bases
Escala de pH (e pOH)
Afinidade por próton Anfoterismo Autoionização da água Constante de dissociação ácida Constante de dissociação básica Extração ácido-base Fisiologia ácido-base Função de acidez Homeostase ácido-base pH Reação ácido-base Solução tampão
Ácidos
Brønsted–Lowry Carboxílicos Fortes Fracos Hidrácidos Lewis Minerais Orgânicos Oxiácidos Superácidos
Bases
Brønsted–Lowry Fortes Fracas Lewis Não nucleofílicas Orgânicas Óxido Superbases
v d e

Em química, constante de basicidade K_b, também chamada constante de dissociação básica ^[1] ou constante de ionização básica^[2] é uma constante de equilíbrio que representa, a uma dada temperatura, o grau de dissociação de uma base de Brønsted, numa reação de equilíbrio químico. É uma medida da força de uma base fraca.

O sistema de equilíbrio para una base fraca em solução aquosa é o seguinte:^[3]

{\ce {B\leftrightharpoons BH^{+}{+}OH-}}

Tal como os ácidos, segundo a teoria de Bronsted-Lowry, uma base forte tem grande tendência a aceitar prótons. Tal tendência depende da espécie com a qual reage. Para se comparar a força das bases, a água é normalmente tomada como referência. A força de uma base pode ser comparada quantitativamente por meio da constante de basicidade: quanto maior for a constante, maior será a tendência da base a dissociar-se e maior será a sua "força".^[4]

Dada a reação de dissociação de uma base genérica ${\ce {BOH}}$

{\ce {BOH\leftrightharpoons B^{+}{+}OH-}}

a constante de dissociação básica K_b é definida por:

{\ce {K_{b}= {\frac {[B^+][OH^{-}]}{[BOH]}}}}

onde $[BOH]$ indica a concentração molar da base $BOH$ na solução.

Os valores das constantes de dissociação reportados pela literatura são convencionalmente obtidos a 20°C; muitas vezes os valores das constantes não são relatados, mas, sim, o correspondente pK_b, que é definido como o cologaritmo de $K_{b}$ :

{\text{pK}}_{\text{b}}=-\log _{10}{\text{K}}_{\text{b}}

Referências

↑ Apesar do termo "dissociação", a base não se dissocia no processo, conforme se pode ver na reação.
↑ Princípios de química analítica: Abordagem teórica qualitativa e quantitativa. Chapter 52: 4.6 Constante de ionização básica (Kb)
↑ La Constante de Basicidad Kb. quimicas.net
↑ Infopédia: constante de basicidade

Ver também

Read other articles:

GD-ROM

GD-ROMGD-ROM logo.pngGdrom.jpgBagian belakang cakram GD-ROMJenis mediaCakram optikKapasitas1 GB[1]PengembangYamahaPenggunaanDreamcastSega NAOMITriforceSega Chihiro Cakram optis Umum Cakram optis Penggerak cakram optis Optical disc authoring Authoring software Teknologi perekaman Recording modes Packet writing Burst cutting area Jenis cakram Compact disc (CD): CD-DA, CD-ROM, CD-R, CD-RW, 5.1 Music Disc, Super Audio CD (SACD), Photo CD, CD Video (CDV), Video CD (VCD), Super Video CD (SV...

خط الخلافة على العرش البريطاني

عرش الملك في مجلس اللوردات، والذي يُلقى منه الخطاب في الافتتاح الرسمي لدورة للبرلمان. خط الخلافة على العرش البريطاني يُحدد عبر النسب والجنس (الذكور الذين ولدوا قبل 28 أكتوبر عام 2011 يسبقون أخواتهم الأكبر سنًا في خط الترتيب) والشرعية والدين. وبموجب القانون العام، يُورث التاج ...

Triumph Thunderbird

Halaman ini berisi artikel tentang sepeda motor Triumph tahun 1950 Triumph. Untuk sepeda motor Triumph lainnya yang menggunakan nama yang sama, lihat Triumph Thunderbird (disambiguasi). Triumph Thunderbird Triumph 6T Thunderbird 1950ProdusenTriumph Engineering Co LtdJuga disebut6T, TR65Tahun Produksi1949–1966Model sebelumnyaSpeed TwinMesinEmpat tak 2 silinder segarisDaya kuda34 bhp (25 kW) at 6300 rpmSistem transmisiEmpat percepatanJarak sumbu roda55 in (1.397 mm)Di...

Daftar film Bollywood

Alam Ara (1931), film India pertama yang bersuara. Ini adalah daftar film yang diproduksi oleh industri film Bollywood di Mumbai yang diurutkan berdasarkan tahun dan dekade perilisannya. 2020-an Daftar film Bollywood pada tahun 2021 Daftar film Bollywood pada tahun 2020 2010-an Daftar film Bollywood pada tahun 2019 Daftar film Bollywood pada tahun 2018 Daftar film Bollywood pada tahun 2017 Daftar film Bollywood pada tahun 2016 Daftar film Bollywood pada tahun 2015 Daftar film Bollywood pada t...

العلاقات الأردنية السنغافورية

العلاقات الأردنية السنغافورية الأردن سنغافورة الأردن سنغافورة تعديل مصدري - تعديل العلاقات الأردنية السنغافورية هي العلاقات الثنائية التي تجمع بين الأردن وسنغافورة.[1][2][3][4][5] مقارنة بين البلدين هذه مقارنة عامة ومرجعية للدولتين: وجه ...

Desert Shores, California

Census-designated place in California, United StatesDesert ShoresCensus-designated placeView east through Desert Shores to the Salton Sea.Location in Imperial County and the state of CaliforniaDesert ShoresLocation in the United StatesCoordinates: 33°24′15″N 116°02′23″W / 33.40417°N 116.03972°W / 33.40417; -116.03972[1]CountryUnited StatesStateCaliforniaCountyImperialArea[2] • Total0.81 sq mi (2.10 km2) •&#...

نظرية ماركس في الاغتراب

قام المفكرالألماني كارل ماركس (1818-1883) بتحديد ووصف أربعة أنواع من Entfremdung (الاغتراب الاجتماعي) التي تصيب العامل في ظل الرأسمالية. جزء من سلسلة حولالماركسية مؤلفات نظرية المخطوطات الاقتصادية والفلسفية (1844) أطروحات حول فويرباخ الأيديولوجية الألمانية بيان الحزب الشيوعي برومير ...

Université de l'Ohio

Si ce bandeau n'est plus pertinent, retirez-le. Cliquez ici pour en savoir plus. Cet article ne s'appuie pas, ou pas assez, sur des sources secondaires ou tertiaires (décembre 2022). Pour améliorer la vérifiabilité de l'article ainsi que son intérêt encyclopédique, il est nécessaire, quand des sources primaires sont citées, de les associer à des analyses faites par des sources secondaires. Cet article est une ébauche concernant une université américaine et l’Ohio. Vous pouvez p...

Главк Морской

В Википедии есть статьи о других людях с именем Главк. Главк Морскойдр.-греч. Γλαῦκος Пол мужской Отец Полиб, Anthedon[d] или Посейдон Мать Евбея[d] или Алкиона Дети Деифоба[d] Медиафайлы на Викискладе Главк Морской или Главк Понтийский (др.-греч. Γλαῦκος) — в древнегр�...

STIE Paripurna

Artikel ini perlu dikembangkan agar dapat memenuhi kriteria sebagai entri Wikipedia.Bantulah untuk mengembangkan artikel ini. Jika tidak dikembangkan, artikel ini akan dihapus. Artikel ini perlu diwikifikasi agar memenuhi standar kualitas Wikipedia. Anda dapat memberikan bantuan berupa penambahan pranala dalam, atau dengan merapikan tata letak dari artikel ini. Untuk keterangan lebih lanjut, klik [tampil] di bagian kanan. Mengganti markah HTML dengan markah wiki bila dimungkinkan. Tambahkan p...

Federico Bahamontes

Spanish cyclist (1928–2023) In this Spanish name, the first or paternal surname is Martín and the second or maternal family name is Bahamontes. Federico BahamontesBahamontes in 1962Personal informationFull nameAlejandro Martín BahamontesNicknameThe Eagle of ToledoBorn(1928-07-09)9 July 1928Santo Domingo-Caudilla, SpainDied8 August 2023(2023-08-08) (aged 95)Valladolid, SpainTeam informationDisciplineRoadRoleRetiredRider typeClimbing specialistProfessional teams1953�...

Manicheismo

Questa voce o sezione sull'argomento religione è priva o carente di note e riferimenti bibliografici puntuali. Sebbene vi siano una bibliografia e/o dei collegamenti esterni, manca la contestualizzazione delle fonti con note a piè di pagina o altri riferimenti precisi che indichino puntualmente la provenienza delle informazioni. Puoi migliorare questa voce citando le fonti più precisamente. Segui i suggerimenti del progetto di riferimento. Monaci manichei intenti a copiare testi sacr...

大字 (数字)

この項目には、一部のコンピュータや閲覧ソフトで表示できない文字が含まれています（詳細）。数字の大字（だいじ）は、漢数字の一種。通常用いる単純な字形の漢数字（小字）の代わりに同じ音の別の漢字を用いるものである。概要壱万円日本銀行券（「壱」が大字）弐千円日本銀行券（「弐」が大字）漢数字には「一」「二」「三」と続く小字と、「壱」「�...

2020年夏季奧林匹克運動會波蘭代表團

2020年夏季奥林匹克运动会波兰代表團波兰国旗IOC編碼POLNOC波蘭奧林匹克委員會網站olimpijski.pl（英文）（波兰文）2020年夏季奥林匹克运动会（東京）2021年7月23日至8月8日（受2019冠状病毒病疫情影响推迟，但仍保留原定名称）運動員206參賽項目24个大项旗手开幕式：帕维尔·科热尼奥夫斯基（游泳）和马娅·沃什乔夫斯卡（自行车）[1]闭幕式：卡罗利娜·纳亚（皮划艇）&#...

Cerreto Grue

Cerreto Grue komune di Italia Tempat Negara berdaulatItaliaDaerah di ItaliaPiemonteProvinsi di ItaliaProvinsi Alessandria NegaraItalia Ibu kotaCerreto Grue PendudukTotal291 (2023 )GeografiLuas wilayah4,75 km² [convert: unit tak dikenal]Ketinggian251 m Berbatasan denganCosta Vescovato Montegioco Sarezzano Villaromagnano SejarahHari liburpatronal festival Santo pelindungSanto George Informasi tambahanKode pos15050 Zona waktuUTC+1 UTC+2 Kode telepon0131 ID ISTAT006058 Kode kadaster I...

Nicholas Ridley, Baron Ridley of Liddesdale

British Conservative Party politician and government minister The Right HonourableThe Lord Ridley of LiddesdalePC1978 portrait, from the National Portrait Gallery collectionSecretary of State for Trade and IndustryIn office24 July 1989 – 14 July 1990Prime MinisterMargaret ThatcherPreceded byThe Lord Young of GraffhamSucceeded byPeter LilleySecretary of State for the EnvironmentIn office21 May 1986 – 24 July 1989Prime MinisterMargaret ThatcherPreceded byKenneth BakerSucc...

Team Lotus

Untuk tim F1 baru yang turun di musim 2010, lihat Lotus Racing. Team LotusNama resmiLotus Engineering Ltd.Kantor pusatHethel, Norfolk, InggrisPendiriColin ChapmanStaf terkenalMaurice Philippe, Peter Wright Peter WarrGérard Ducarouge Frank DernieSam MichaelPembalap terkenalJim Clark[1] Graham HillEmerson FittipaldiJochen Rindt Mario AndrettiNigel MansellAyrton SennaNelson Piquet Mika HäkkinenSejarah dalam ajang Formula SatuMesinBorgward,Coventry Climax,BRM,Maserati,Ford-Cosworth,Rena...

Blu-ray

Digital optical disc format Blu-rayReverse side of a Blu-ray. Unlike CD and DVD, the reflection has a blue hue. Branded colors include silver, gold, and grey.Media typeHigh-density optical discEncodingData encoding: CLV or Zoned CAV pits-and-lands with interleaved error correction codeBDMV Video encoding:H.262/MPEG-2 Part 2H.264/MPEG-4 AVCVC-1H.265/HEVC (only Ultra HD Blu-ray)Capacity25 GB (single-layer)50, 66 GB (dual-layer)100, 128 GB (BDXL)(Up to four layers are possible in a standard form...

Academic library

Library attached to a higher education institution Wikiversity has learning resources about Academic library Library of Trinity College Dublin, established in 1592 on libraryAn academic library is a library that is attached to a higher education institution and serves two complementary purposes: to support the curriculum and the research of the university faculty and students.[1] It is unknown how many academic libraries there are worldwide. An academic and research portal maintained ...

Metz

City in Grand Est, France For other uses, see Metz (disambiguation). Prefecture and commune in Grand Est, FranceMetzPrefecture and communeClockwise from top: overview of city centre 1(with Cathedral of Saint Stephen), Imperial Quarter, Temple Neuf, Germans' Gate, Opéra-Théâtre (place de la Comédie) FlagCoat of armsLocation of Metz MetzShow map of FranceMetzShow map of Grand EstCoordinates: 49°07′13″N 6°10′40″E / 49.12028°N 6.17778°E / 49.12028; 6.17778C...

/profillengkap.com/index.php/article/Iowa State Guard

/profillengkap.com/index.php/article/Kindernet

/profillengkap.com/index.php/article/Chaco eagle

Bra, Piemonte

Undhang-Undhang Bantěn

Nino Rešić

Pemalang (kota)

This Can't Happen Here

Pembagian administratif Honduras

Zámutov

Kwiambal National Park

Tunggal Jaya, Teras Terunjam, Mukomuko