A laboratory technician bubbles sulfur dioxide (SO2SO_2SO2) gas and dinitrogen pentoxide (N2O5N_2O_5N2O5) gas into separate flasks containing distilled water. A strip of blue litmus paper is then immersed into each flask.
State the final colour of the litmus paper observed in both flasks and explain this observation by referring to the chemical nature of these oxides and the specific ions responsible for the change.
276 exam-style questions on Edexcel GCSE Chemistry 4.1 Acids, covering 4.1.1 Acids, alkalis and the pH scale, 4.1.2 Hydrogen ion concentration and pH, 4.1.3 Dilute and concentrated, weak and strong acids, 4.1.4 Bases, alkalis and the reactions of acids, 4.1.5 Chemical tests for hydrogen and carbon dioxide, 4.1.6 Neutralisation as a reaction of acids with bases, 4.1.7 Preparing soluble salts, and 4.1.8 Solubility rules and preparing insoluble salts. Each one has a worked solution and a mark scheme showing where the marks go.