Question: Answer 0.862 Sample problem 3 Sodium phosphate, Na3POs, can be used to clean paint brushes and grease spills. A commercial preparation of the cleaner was

Answer 0.862 Sample problem 3 Sodium phosphate, Na3POs, can be used

Answer 0.862

Sample problem 3 Sodium phosphate, Na3POs, can be used to clean paint brushes and grease spills. A commercial preparation of the cleaner was analysed by taking 10.00 mL samples and titrating them against a standard solution of HCl, of concentration 0.2021 mol L'!. The indicator selected showed when the following reaction had just occurred: Na3PO4(aq) + 2HCl(aq) + NaH2PO4(aq) + 2NaCl(aq) The burette readings are shown below. Calculate the concentration of sodium phosphate. Initial burette reading (ml) Final burette reading (ml) Titre (ml) 1 0.40 19.21 2 2.13 20.53 3 3.11 21.56 4 0.69 19.13 18.44 18.81 18.4 18.45

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