1. Interaction proceeds according to the equation:
3K2CO3 + 2H3PO4 = 2K3PO4 + 3H2O + 3CO2 ↑;
2.It can be seen from the reaction that the amounts of carbon dioxide and phosphoric acid are related by the ratio:
3 * n (CO2) = 2 * n (H3PO4);
3.Calculate the amount of carbon dioxide:
n (CO2) = (2 * n (H3PO4)): 3;
n (CO2) = 2 * 0.85: 3 = 0.5667 mol;
4.determine the volume of the evolved gas using the formula:
V (CO2) = n (CO2) * Vm, where Vm = 22.4 dm3 / mol;
V (CO2) = 0.5667 * 22.4 = 12.69 dm3.
Answer: 12.69 dm3.
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