Calculate the mass of sodium hydroxide required to obtain 8.2 g of sodium phosphate.
June 17, 2021 | education
| 1. Sodium phosphate can be obtained by the reaction:
3NaOH + H3PO4 = Na3PO4 + 3H2O;
2. Calculate the chemical amount of sodium orthophosphate:
n (Na3PO4) = m (Na3PO4): M (Na3PO4);
M (Na3PO4) = 23 * 3 + 31 + 4 * 16 = 164 g / mol;
n (Na3PO4) = 8.2: 164 = 0.05 mol;
3. Determine the amount of sodium alkali:
n (NaOH) = n (Na3PO4) * 3 = 0.05 * 3 = 0.15 mol;
4. We calculate the mass of sodium hydroxide using the calculation formula:
m (NaOH) = n (NaOH) * M (NaOH);
M (NaOH) = 23 + 16 + 1 = 40 g / mol;
m (NaOH) = 0.15 * 40 = 6 g.
Answer: 6 g.
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