a) What are the concentrations of Na2HPO4 and NaH2PO4 in a 0.30 M phosphate buffer solution pH 7.0? Use pKa 6.82
b) Describe how you would prepare 250 mL of the buffer in part (a) given that you have available to you a 1.0 M stock solution of NaH2PO4 and solid Na2HPO4(FW 141.96 g/mol). Provide your answer in milliliters of NaH2PO4 and grams of Na2HPO4.
c) Suppose you use 100 ml of this buffer in an experiment and 0.003 mol of H+ were generated as a result of the reaction. What would be the pH at the end of the reaction?
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a) What are the concentrations of Na2HPO4 and NaH2PO4 in a 0.30 M phosphate buffer solution...
1) Solution Components A 1 mL 100 mM NaH2PO4 + 9 mL 100 mM Na2HPO4 B 5 mL 100 mM NaH2PO4 + 5 mL 100 mM Na2HPO4 C 9 mL 100 mM NaH2PO4 + 1 mL 100 mM Na2HPO4 D 10 mL 100 mM NaH2PO4 stock solution E 10 mL 100 mM Na2HPO4 stock solution F 10 mL distilled water pKa of phosphate: 6.8 How would you calculate the pH of each equation using the Henderson Hasselbalch equations? 2) Tris...
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A buffer solution contains 0.235 M NaH2PO4 and 0.371 M Na2HPO4 If 0.0297 moles of nitric acid are added to 225 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume change does not change upon adding nitric acid pH =
a buffer with a ph of 7.5 is needed. which combination of concentrations of Nah2po4 ( ka=6.2 x10-8) and Na2HPO4 (ka=4.8 x10-13) would give a ph closest to 7.5? a) 0.1 M NaH2PO4 and 0.9 M Na2HPO4 b)1.0 M NaH2PO4 and 1.0 M Na2HPO4 c) 0.1M NaH2PO4 and 0.2 M Na2HPO4 d) 0.9 M NaH2PO4 and 0.1 M Na2HPO4
You are instrucbed to create 900. mL of a 0.59 M phosphate buffer with a pH of 6.4. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. numerical answers to three significant H3PO4(s)H20)H3 aH2PO4(aq) H2PO4-(aq) + H2O(りーH3O + (aq) + HP042-(aq) Ka2-6.2×10-8 HPO()H20()H3)PO43 (aq) Ka 4.8x10-13 Ka 6.9x10-2 Which of the available chemicals will you use for the acid component of your buffer? O H3PO4 O Na2HPO Na3PO4 Which of the available chemicals will you use...