Document page
chemistry igcse acapprinted 99 · PDF 99
145 pagesrevision 46934
printed 99 · PDF 99
Page image rendered from the stored file at 110 dpi; it sharpens as you zoom. Outlines are placed from each region’s stored position on the page (612 × 792 pt).
readable
Source of this text: embedded text layer. The better of the embedded text and OCR is kept.
99
C) Amphoteric oxide
D) Neutral oxide
4. What is the name of the salt formed when sulfuric acid reacts with potassium hydroxide?
A) Potassium sulfate
B) Potassium nitrate
C) Potassium chloride
D) Potassium carbonate
5. Which of the following indicators would show a color change in an acidic solution?
A) Phenolphthalein turning pink
B) Universal indicator turning green
C) Litmus turning red
D) Methyl orange turning yellow
P4
1. Describe how you would prepare a pure sample of an insoluble salt such as barium sulfate in the
laboratory, including the names of reagents used and the steps involved.
2. Explain the concept of strong and weak acids in terms of ionization, and provide examples of
each. Describe how you could differentiate between them experimentally.
3. Describe what happens when ammonia gas dissolves in water. Write an equation for this
reaction and explain the role of ammonia in terms of proton transfer.
4. Explain the purpose of using indicators in titration experiments. Describe how you would carry
out a titration experiment to determine the concentration of a hydrochloric acid solution using
sodium hydroxide and an appropriate indicator.