Show your work, use general chemistry rules for significant figures. 6. A solution is made by dissolving 1.0 x 10–4 mol of Na3PO4 in 200.00 mL of water. Then 0.25 mL of 0.200 F HCl is added to the solution. H3PO4 ⇌ H+ + H2PO4– Ka1 = 7.11 x 10–3 H2PO4– ⇌ H+ + HPO42– Ka2 = 6.34 x 10–8 HPO42– ⇌ H+ + PO43– Ka3 = 4.17 x 10–13 (a) What is the pH of the resultant solution? (b) An additional 0.75mL of 0.200 F HCl is added to the solution from the end of part (a). What is the pH of the resultant solution? (c) Finally, an additional 0.50 mL of 0.200 F HCl is added to the solution from the end of part (b). What is the pH of the resultant solution?
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Show your work, use general chemistry rules for significant figures.
6. A solution is made by dissolving 1.0 x 10–4 mol of Na3PO4 in 200.00 mL of water. Then 0.25 mL of 0.200 F HCl is added to the solution.
H3PO4 ⇌ H+ + H2PO4– Ka1 = 7.11 x 10–3
H2PO4– ⇌ H+ + HPO42– Ka2 = 6.34 x 10–8
HPO42– ⇌ H+ + PO43– Ka3 = 4.17 x 10–13
(a) What is the pH of the resultant solution?
(b) An additional 0.75mL of 0.200 F HCl is added to the solution from the end of part (a). What is the pH of the resultant solution?
(c) Finally, an additional 0.50 mL of 0.200 F HCl is added to the solution from the end of part (b). What is the pH of the resultant solution?
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