Umiejętności z tego działu sprawdza 137 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 49 z 54 arkuszy w bazie.
Nitric acid, HNO3, is strong, while nitrous acid, HNO2, is weak. (i) Outline the difference between a strong and a weak acid. (ii) Deduce the Lewis formula and the molecular geometry for the nitrite ion, NO2−. (iii) State the hybridization…
Hydrochloric acid, HCl(aq), and hydroiodic acid, HI(aq), ionize completely in water, whereas propanoic acid, CH3CH2COOH(aq), ionizes only partly. 25.0 cm3 of 0.200 mol dm−3 HCl(aq) was titrated with sodium…
(i) Write a balanced equation for the reaction, including state symbols. (ii) Deduce what property of this reaction makes it possible to follow its rate by both methods. (iii) Magnesium carbonate was used in excess so that all of the acid would react.…
Some ionic compounds are the product of acid–base neutralization reactions. (i) State the names of the acid and the base that would produce sodium methanoate, HCOONa. (ii) Estimate the pH value of an aqueous solution of sodium methanoate. (iii) Ionic salts can…
(c) After 30 minutes, the student stopped heating the mixture and titrated a sample of the solution remaining in the flask with NaOH to determine the experimental yield of propanoic acid. Explain why the titrated sample will give an incorrect value for the…
Complete the table for Trial 1 and so determine its Ka value. Use section 1 of the data booklet.
Calculate the pH of a 0.125 mol dm−3 solution of sodium hydroxide.
A sample of the sodium hydroxide solution is gradually added to 25.0 cm3 of an aqueous solution of an unknown organic acid, producing the following pH curve. Calculate the concentration of the unknown organic acid.
The titration curve below was obtained when the sodium hydroxide solution was added to 25.0 cm3 of the unknown organic acid in part (b). State, with a reason, which indicator would be appropriate for this titration, using section 18 of the data booklet.
Suggest two different mixtures, each prepared from the unknown organic acid, that would produce a buffer solution.
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