Si definisce una soluzione tampone una soluzione che si oppone alla variazione del pH per aggiunte moderate di acidi o basi Si tratta generalmente di soluzioni di un acido debole e il suo sale formato con una base forte (per esempio il sistema acido acetico - acetato di sodio) o viceversa di una base debole e il suo sale formato con un acido forte (per esempio il sistema ammoniaca [H +] 2 = K a1 H2CO3 K a2 H2CO3 = 4 4510-7 4 6910-11 = 2 110-17 [H +] = 2 110-17 = 4 610-9 mol/L pH = – log [H +] = -log 4 610-9 = 8 34 In conclusione per calcolare il pH di una soluzione 0 20 M di NaHCO 3 che vale 8 34 devi utilizzare entrambe le costanti di dissociazione dell'acido carbonico

Na2CO3 + HC2H3O2 = CO2 + H2O + NaC2H3O2

Na2CO3 + HC2H3O2 = Na(C2H3O2) + H2CO3 Na2CO3 + HC2H3O2 = Na2C2H3O2 + H2O + CO2 Na2CO3 + HC2H3O2 = NaC2H3O2 + CO + H2O Na2CO3 + HC2H3O2 = NaC2H3O2 + CO2 + H2O PbS + PbSO4 = Pb + SO2 HCl + CaCO3 = CaCl2 + H2O + CO2 Na2SO3 = Na2S + Na2SO4 C3H4 + AgNO3 + NH3 = C3Ag4 + NH4NO3 Recently Balanced Equations Calculators

Three components are involved in the carbonic acid formation: CO2(aq) H2CO3 HCO3 - true carbonic acid dissolved CO2 hydrogen carbonate 4 Two of them are bundled into one entity: CO2(aq)H2CO3 true carbonic acid dissolved CO2 the composite carbonic acid H2CO3* = + It's just the composite carbonic acid (and not the true carbonic acid) that is commonly known as the carbonic acid 5 True and

กรด คือ สารประกอบที่มี H และเมื่อละลายน้ำจะแตกตัวให้ H+ หรือ H3O+ เป็น สารที่สามารถให้โปรตอน (proton donor) แก่สารอื่น เบส คือ สารประกอบที่มี OH และเมื่อละลาย

For polyprotic acids the first Ka is always the largest followed by the second etc this indicates that the protons become successively less acidic as they are lost Although the tendency to lose each acidic proton decreases as subsequent ones are lost all possible ionic species do exist in solution to calculate their fractional concentration one can use equations that rely on

Een zwak zuur is een zuur dat in water niet volledig ioniseert De gevormde ionen (protonen en een zuurrest) blijven in evenwicht met het moleculaire zuur: () ↔ + + − ()De ligging van het evenwicht wordt bepaald door de grootte van de evenwichtsconstante: = [+] [−] [] De meeste zuren zijn zwakke zuren slechts enkele zijn sterk De meeste organische zuren zijn zwak met meervoudige

CIDO CARBNICO Peligros Propiedades Aplicaciones y

El H2CO3 tambin se puede encontrar en el carbn meteoros volcanes lluvia cida aguas subterrneas ocanos y plantas Preparacin del cido carbnico El cido carbnico se forma cuando el dixido de carbono se disuelve en el agua y slo puede existir en una solucin Esta reaccin es tpicamente en equilibrio lo que significa que el cido carbnico forma parcial y

A monoprotic acid donates only one proton or hydrogen atom per molecule to an aqueous solution This is in contrast to acids capable of donating more than one proton/hydrogen which are called polyprotic acids Polyprotic acids may be further categorized according to how many protons they can donate (diprotic = 2 triprotic = 3 etc )

H2CO3 can also be found in coal meteorites volcanoes acid rain groundwater oceans and plants (Carbonic acid Formula S F ) Carbonic acid and carbonate salts Carbonic acid is formed in small amounts when its anhydride Carbon dioxide (CO2) is dissolved in water CO2 + H2O ⇌ H2CO3 The predominant species are simply hydrated CO2 molecules Carbonic acid may be considered to be a

Een zwak zuur is een zuur dat in water niet volledig ioniseert De gevormde ionen (protonen en een zuurrest) blijven in evenwicht met het moleculaire zuur: () ↔ + + − ()De ligging van het evenwicht wordt bepaald door de grootte van de evenwichtsconstante: = [+] [−] [] De meeste zuren zijn zwakke zuren slechts enkele zijn sterk De meeste organische zuren zijn zwak met meervoudige

For each compound enter compound name (optional) concentration and Ka/Kb or pKa/pKb values For example: CH3COOH pKa=4 76 c=0 1 HCl pKa=-10 c=0 1 Case 2 Solution is formed by mixing known volumes of solutions with known concentrations For each compound enter compound name (optional) concentration volume and Ka/Kb or pKa/pKb values For example: CH3COOH pKa=4 76 c=0 1 v=10

Noms des acides Formules Bases Ka pKa conjugues Iodure d'hydrogne HI I- ≈ 1010 ≈ - 10 Acide perchlorique HClO4 ClO4 - ≈ 4 108 ≈ - 8 6 Bromure d'hydrogne HBr Br - ≈ 108 ≈-8 Chlorure d'hydrogne HCl Cl - ≈ 106 ≈-6 Acide sulfurique (I) H2SO4 HSO4 - ≈ 104 ≈-4 Acide nitrique HNO3 NO3 - ≈ 102 ≈ -2 Ion Hydronium H3 O + H2 O 55 5 - 1 74 Acide Trichloractique

Dioksidi i karbonit tretet ne uje duke formuar acidin karbonik H2CO3 kysht sht nje acid i dobet dhe nuk sht i qendrueshem ne gjendje te lire prandaj menjehere zberthehet ne oksidin e karbonit dhe ne uje Ky eshe reaksioni : + N oqean Dioksidi i karbonit shprndahet n oqean pr t formuar acid karbonik () bikarbonat (−) dhe karbonat (−) Ka rreth pesdhjet her m

Киселините са вещества които участват в химични реакции с основи приемайки електрони отдадени от основите Повечето киселини с практическо значение са водоразтворими При разтварянето си те се дисоциират на

pH Calculator

For each compound enter compound name (optional) concentration and Ka/Kb or pKa/pKb values For example: CH3COOH pKa=4 76 c=0 1 HCl pKa=-10 c=0 1 Case 2 Solution is formed by mixing known volumes of solutions with known concentrations For each compound enter compound name (optional) concentration volume and Ka/Kb or pKa/pKb values For example: CH3COOH pKa=4 76 c=0 1 v=10

26/10/2015H2CO3 is a weak electrolyte so the first equilibrium will lie to the left and very little will ionize So H2CO3 will be the predominant species 0 0 0 Log in to reply to the answers Post KennyB Lv 7 5 years ago The answer they are probably looking for is H+ because H2CO3 dissolves into 2H+ and one CO3-2 Hence twice as much 0 0 2 Log in to reply to the answers Post Still have questions

Ento podemos verificar a relao existente entre equilbrio qumico dos cidos e bases definidos pelos Ka e Kb E uma vez conhecendo esses valores podemos estimar a fora de um cido ou de uma base quanto s suas respectivas ionizao e dissociao em gua Erivanildo Lopes da Silva e professor assistente do curso de Qumica da Universidade Federal da Bahia - campus ICADS

H2CO3(aq) H+(aq) + HCO3-(aq) Additional H+ is consumed by HCO3- and additional OH- is consumed by H2CO3 The value of Ka for this equilibrium is 7 9 10-7 and the pKa is 6 1 at body temperature In blood plasma the concentration of hydrogen carbonate ion is about twenty times the concentration of carbonic acid The pH of arterial blood plasma is 7 40 If the pH falls below this normal

H2CO3 can also be found in coal meteorites volcanoes acid rain groundwater oceans and plants (Carbonic acid Formula S F ) Carbonic acid and carbonate salts Carbonic acid is formed in small amounts when its anhydride Carbon dioxide (CO2) is dissolved in water CO2 + H2O ⇌ H2CO3 The predominant species are simply hydrated CO2 molecules Carbonic acid may be considered to be a

20/07/2008Since H2CO3 is an acid (carbonic ACID) it is a proton donor this rules out B and C Now look at it's Ka value: Ka = [Products]/[Reactants] = [H+][HCO3-]/[H2CO3] Ka = 4 3*10^-7 This Ka value is very small and in order to get this small a number [H+] has to be very small while [H2CO3] is very large Because [H+] is small we see that H2CO3 is a poor hydrogen donor Therefore the answer is A

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