Peroxycarboxylic acids are organic compounds containing the −COOOH-\text{COOOH}−COOOH functional group. Peroxypropanoic acid, CH3CH2COOOH\text{CH}_3\text{CH}_2\text{COOOH}CH3CH2COOOH, can be prepared by reacting hydrogen peroxide with propanoic acid in a heterogeneous equilibrium mixture:
H2O2(aq)+CH3CH2COOH(aq)⇌CH3CH2COOOH(aq)+H2O(l)Kc=0.42 dm3 mol−1 \text{H}_2\text{O}_2(\text{aq}) + \text{CH}_3\text{CH}_2\text{COOH}(\text{aq}) \rightleftharpoons \text{CH}_3\text{CH}_2\text{COOOH}(\text{aq}) + \text{H}_2\text{O}(\text{l}) \quad K_c = 0.42 \text{ dm}^3 \text{ mol}^{-1} H2O2(aq)+CH3CH2COOH(aq)⇌CH3CH2COOOH(aq)+H2O(l)Kc=0.42 dm3 mol−1A 500 cm3500 \text{ cm}^3500 cm3 equilibrium mixture contains concentrations of 0.400 mol dm−30.400 \text{ mol dm}^{-3}0.400 mol dm−3 H2O2(aq)\text{H}_2\text{O}_2(\text{aq})H2O2(aq) and 0.600 mol dm−30.600 \text{ mol dm}^{-3}0.600 mol dm−3 CH3CH2COOH(aq)\text{CH}_3\text{CH}_2\text{COOH}(\text{aq})CH3CH2COOH(aq).
Calculate the amount, in mol, of peroxypropanoic acid in the equilibrium mixture.
23 exam-style questions on OCR A A Level Chemistry Chemical equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.