(a) State an indicator suitable for the titration of;
(i) dilute HCl and NaOH\(_{3(aq)}\)
(ii) dilute CH\(_3\)COOH and KOH\(_{(aq)}\)
(iii) dilute HCl and NH\(_{3(aq)}\).
Give a reason for your answer in each case.
(b) Calculate the volume of water that would be added to 50 cm\(^3\) of 0.10 mol dm\(^{-3}\) of HCI to dilute it to 0.010 mol dm \(^{-3}\)
(c) Name one gas that could be used to demonstrate the fountain experiment.
(a)(i) Phenolphthalein or methyl orange or methyl red. Titration of strong acid and strong base.
(ii) Phenolphthalein reasons; Titration of a weak acid and strong base
(iii) Methyl orange or Methyl red reason: Are strong acid and weak base
(b) Using dilution law;
C\(_1\)V\(_1\) = C\(_2\)V\(_2\)
0.1 x 50 = 0.010 x V\(_2\)
V\(_2\) = \(\frac{0.1 \times 50}{0.010}\) = 500 cm\(^3\)
Volume of distilled water to be added to the original solution to make 0.01 mol/dm\(^3\)
= 500 - 50
= 450 cm\(^{3}\)
(c) Hydrogen chloride gas or ammonia or sulphur (IV) oxide
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