A student investigates the solubility of four metal oxides and four non-metal oxides in water. The student tests the pH of the solutions formed. The table shows the student’s results The student makes two conclusions. Conclusion 1: ‘All metal oxides produce alkaline solutions.’ Conclusion 2: ‘All non-metal oxides produce acidic solutions.’ Explain why the student’s conclusions are only partly correct. Use information from the table above. – 6154

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1. A pH above 7 is alkaline, and metals like sodium, calcium, and magnesium oxides form alkaline solutions.

   But not all metal oxides dissolve, like zinc oxide, so Conclusion 1 is not fully correct.

   A pH below 7 is acidic, and non-metal oxides like carbon dioxide, sulfur dioxide, and phosphorus oxide form acidic solutions.

   However, silicon oxide doesn’t dissolve in water, so Conclusion 2 is also not fully correct.

   Reply