Proton transfer reactions

Nitric acid, $\ce{HNO3}$, is strong, while nitrous acid, $\ce{HNO2}$, 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, $\ce{NO2-}$.

(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…

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 cm$^3$ of an aqueous solution of an unknown organic acid, producing the following pH curve. Calculate the concentration of the unknown organic acid.

In aqueous solution hydrogen cyanide behaves as a weak acid. (i) Write an equation for the ionization of hydrogen cyanide in water. (ii) Outline two ways in which a solution of 0.050 $\mathrm{mol\,dm^{-3}}$ $\ce{HCN}$ could be distinguished experimentally from…

Cresolphthalein is manufactured from 2-methylphenol, $\ce{CH3C6H4OH}$. State an equation that shows 2-methylphenol acting as a Brønsted–Lowry acid.

The structure of galantamine is shown below. (i) State the type of structural formula shown. (ii) State the name of the functional group that contains the nitrogen atom. (iii) Outline the effect of this functional group on the pH of water in which galantamine…

Nitrogen dioxide reacts with rain water and oxygen to form nitric acid. (i) State an equation for this reaction, including state symbols. (ii) Explain, with reference to the oxidation states of two elements, why this is a redox reaction. (iii) Describe the…

What is the conjugate acid of the hydrogen phosphate ion, $\ce{HPO4^2-}$? A. $\ce{PO4^3-}$ B. $\ce{H2PO4-}$ C. $\ce{H3PO4}$ D. $\ce{HPO3^2-}$

What is the pH of a 0.020 $\mathrm{mol\,dm^{-3}}$ solution of nitric acid, $\ce{HNO3(aq)}$? A. 1.0 B. 1.7 C. 2.0 D. 12.3