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AQA A-level CHEMISTRY Paper 2 Organic and Physical Chemistry Monday 8 June 2023
7405 CHEMISTRY
7405 CHEMISTRY
This question is about rates of reaction. Phosphinate ions (H2PO –) react with hydroxide ions to produce hydrogen gas as shown. H2PO – + OH− → HPO2– + H A student completed an experiment to determine the initial rate of this reaction. The student used a solution containing phosphinate ions and measured the volume of hydrogen gas collected every 20 seconds at a constant temperature. Figure 1 shows a graph of the student’s results. Figure 1
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