Zadanie 26
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 14 zadań wzorowanych na arkuszach IB z lat 2022–2026.
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Zadanie 24
What is the conjugate acid of the hydrogen phosphate ion, HPO42−? A. PO43− B. H2PO4− C. H3PO4 D. HPO32−
Zadanie 30
Which is a conjugate acid-base pair? A. H2CO3 / CO32− B. H2SO4 / SO42− C. HSO4− / SO42− D. CH3NH3+ / CH3NH−
Zadanie 2a
Methanoic acid, HCOOH(aq), and hydrochloric acid, HCl(aq), are both acids. A 0.100 mol dm−3 solution of HCOOH(aq) has a pH of 2.39 while a solution of HCl(aq) of the same concentration has a pH of 1.00. (i) Explain…
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 20
What is the conjugate base of H2PO4−? A. H3PO4 B. HPO42− C. PO43− D. H3O+
Zadanie 20
Which of these species has the weakest conjugate base? A. CH3COOH B. NH4+ C. H2O D. HNO3
Zadanie 20
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 19
What is the formula of the conjugate base of methanoic acid, HCOOH? A. HCOOH2+ B. H3O+ C. HCOO− D. OH−
Zadanie 19
Which species is the conjugate base of methanoic acid, HCOOH? A. HCOOH2+ B. HCOO− C. HCO3− D. CH3O−
Zadanie 2e
Methylamine is a gas that dissolves in water to form an alkaline solution: CH3NH2(aq) + H2O(l) ⇌ CH3NH3+(aq) + OH−(aq) (i) State the relationship between CH3NH3+ and CH3NH2 in terms of the Brønsted-Lowry theory. (ii) A sample of…
Zadanie 19
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 20
What is the strongest base in the equilibrium below? NH3 + H2O ⇌ NH4+ + OH− Kc = 3.2 × 10−7 A. NH3 B. H2O C. NH4+ D. OH−
Zadanie 20
Which acid has the weakest conjugate base? A. HF B. CH3COOH C. HNO3 D. NH4+