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- What is the pH when preparing a solution od 1 mol NaOH and 2 mol of solid NaH2PO4? The pKa's of phosphoric acid are: 2.1, 7.2, and 12.4.Calculate the pH of a 2.00 M Na2CO3 given that the pKa’s of the first and second dissociation of H2CO3 (aq) acid are 6.37 and 10.32, respectively.Using the concentrations 0.100M and 0.1766M, and the pKa of 3.752, what is the theoretical pH of a buffer solution?
- What will be the pH of a buffer solution containing an acid with a pKa of 5.4 with an acid concentration equivalent to that of its conjugate base?A hypothetical weak acid, HA, was combined with NaOH in the followingproportions: 0,20 mol HA, 0,08 mol NaOH. The mixture was diluted to a totalvolume of 1,0 L and the pH was found to be 4,80. a). What is the pKa of the acid?What is the pH of a buffer solution that contains 0.180 M of a fictitious base and 0.135 M of its conjugate acid? The pK b of the base is 5.720.
- What is the pH of an acidic mixture containing 0.062 M hydrazoic acid (Ka = 1.9 * 10-5) and 0.062 M hypobromous acid (Ka = 2.0 * 10-9)?What is the pH and fraction of dissociation of a 0.100 M solution of the weak acid HA with Ka =1.00 X10(-5)?A solution is made by dissolving 0.111 moles of N2H4 (Kb = 3.0 x 10-6 ) and 0.199 moles of N2H5Cl in water and diluting to 1.00 L. What is the pH of the resulting solution?
- Calculate the pH of a buffer solution containing 10.0 cm3 of 0.100 mol dm–3 NaOH and 20.0 cm3 of 0.500 mol dm–3 ethanoic (acetic) acid made up to a total of 50.0 cm3 in a volumetric flask at 298 K. The pKa of ethanoic acid at 298 K is 4.77Consider a biochemical reaction that is taking place in a 0.1 M buffer. The initial pH is 7.4, and the pKa of the buffer is 7.2. If, in a final reaction volume of 1.0 mL, 10 micromol of protons are generated, what would be the final pH of the solution?After a buffer solution of carbonic acid (with pKa of 3.75) was added with 1ml of sulfuric acid, the resulting pH of the carbonic acid buffer solution is 1.25. Do you think the carbonic buffer system still works effectively after the addition of the said acid?