(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…
Which of these salts, when dissolved in water to make solutions of equal concentration, has the highest pH? A. B. C. D.
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 could be distinguished experimentally from…
Each indicator contains more than one benzene ring. (i) State one functional group, other than the phenyl group, that is present in all three indicators. (ii) Deduce the colour of light absorbed by bromothymol blue in acidic conditions and by bromophenol blue…
Cresolphthalein is manufactured from 2-methylphenol, . State an equation that shows 2-methylphenol acting as a Brønsted–Lowry acid.
Cresolphthalein is a weak acid that can be represented as HIn. Using an equation, explain why the colour of a solution containing cresolphthalein depends on its pH.
A strong acid is placed in a conical flask and a strong base is added to it from a burette. Which graph shows the pH curve for this titration? A. Graph A B. Graph B C. Graph C D. Graph D
(i) Outline the way in which ammonia behaves as a Lewis base during the formation of the complex ion . (ii) Determine the pH at 298 K of an aqueous ammonia solution of concentration 0.180 . Use section 1 of the data…
The rate of the reaction can be followed by measuring the volume of carbon dioxide collected as time passes. The graph shows the results obtained at 20 °C. (i) Sketch, on the same axes, the curve you would expect if the experiment were repeated with the acid…
The structure of galantamine is shown below. (i) State the name of the functional group that contains the nitrogen atom. (ii) Outline the effect of this functional group on the pH of water in which galantamine is dissolved, giving the direction of the change…