Zadanie 33
What is the conjugate acid of the hydrogencarbonate ion, HCO3−? A. CO32− B. CO2 C. H2CO3 D. H3O+
Conjugate acid-base pairs
Write the formula of the conjugate base of any acid (remove H+) and the conjugate acid of any base (add H+), and identify the two conjugate pairs in an acid-base reaction equation.
Tę umiejętność sprawdza 12 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 12 Otwórz w wyszukiwarce z filtrami
Zadanie 31
What is the conjugate acid of the hydrogen phosphate ion, HPO42−? A. PO43− B. H2PO4− C. H3PO4 D. HPO32−
Zadanie 2d
Sulfurous acid has the formula H2SO3. (i) Using the concept of formal charge, outline why Lewis formula 2 is the more stable, preferred structure. (ii) Write the formula for the conjugate base formed from sulfurous acid.
- Materiał graficzny
Zadanie 3a
Methanoic acid, HCOOH, is a weak acid, and solutions of it are often used as acidic buffers. A chemist prepared a 0.500 mol dm−3 solution of methanoic acid, in which two conjugate acid–base pairs are present. (i) For each pair, state the…
Zadanie 1b
The structure of a tartaric acid molecule is shown. (i) State how many hydrogen atoms in a tartaric acid molecule are acidic. (ii) Deduce the structural formula of the conjugate base of tartaric acid. (iii) Predict, giving a reason, whether tartaric acid is a…
- Materiał graficzny
Zadanie 24
Which two species form a conjugate acid-base pair in this reaction? HCOOH(aq) + NH3(aq) ⇌ HCOO−(aq) + NH4+(aq) A. HCOOH and HCOO− B. HCOOH and NH3 C. NH3 and HCOO− D. HCOOH and NH4+
Zadanie 28
What is the conjugate base of H2PO4−? A. H3PO4 B. HPO42− C. PO43− D. H3O+
Zadanie 25
Which row correctly describes a weak Brønsted–Lowry acid? A. Ionizes only partially; its conjugate base is relatively strong B. Ionizes almost completely; its conjugate base is relatively strong C. Ionizes almost completely; its conjugate base is very weak D.…
Zadanie 4a
State the relationship between CH3NH3+ and CH3NH2 in terms of the Brønsted-Lowry theory.
Zadanie 24
Which species are Brønsted–Lowry acids in the equilibrium below? HCO3−(aq) + H2O(l) ⇌ H3O+(aq) + CO32−(aq) A. HCO3− and H2O B. H2O and CO32− C. H3O+ and CO32− D. HCO3− and H3O+
Zadanie 25
What is the strongest base in the equilibrium below? NH3 + H2O ⇌ NH4+ + OH− Kb = 1.8 × 10−5 A. NH3 B. H2O C. NH4+ D. OH−
Zadanie 25
Which acid has the weakest conjugate base? A. HF B. CH3COOH C. HNO3 D. NH4+