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What is the pH of a buffer prepared by mixing 100 mL 0.050 mM NaH2PO4 and 25 mL 0.075 mM Na2HPO4? (pKa1=2.2; pKa2= 7.21; pKa3=12.7)
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- Consider the following two acids: pKa1 = 2.98; pKa2 = 13.40 HO2CCH2CH2CH2CH2CO2H Adipic acid pKa1 = 4.41; pKa2 = 5.28 In two separate experiments the pH was measured during the titration of 5.00 mmol of each acid with 0.200 M NaOH. Each experiment showed only one stoichiometric point when the data were plotted. In one experiment the stoichiometric point was at 25.00 mL added NaOH, and in the other experiment the stoichiometric point was at 50.00 mL NaOH. Explain these results.Lactic acid is a common by-product of cellular respiration and is often said to cause the burn associated with strenuous activity. A 25.0-mL sample of 0.100 M lactic acid (HC3H5O3, pKa = 3.86) is titrated with 0.100 M NaOH solution. Calculate the pH after the addition of 0.0 mL, 4.0 mL, 8.0 mL, 12.5 mL, 20.0 mL, 24.0 mL, 24.5 mL, 24.9 mL, 25.0 mL, 25.1 mL, 26.0 mL, 28.0 mL, and 30.0 mL of the NaOH. Plot the results of your calculations as pH versus milliliters of NaOH added.What will be the appropriate pH of a buffer prepared by mixing 100 ml of 0.1 M Na2HPO4 and 100 ml of 0.1 M NaH2PO4? (For H3PO4, pKa1 = 2.1; pKa2 = 6.8; pKa3 = 12.5)
- Consider a buffer prepared by mixing 0.100 M propionic acid (CH3CH2COOH, pKa = 4.87) and 0.200 M sodium propionate (NaCH3CH2COO). Which species will most likely react upon addition of aqueous HCl solution? CH3CH2COOH CH3CH2COO– H2O Na+What is the pH of a buffer that results when 5.46 mole of H3PO4 is mixed with 2.97 mole of NaOH and diluted with water to 1.00 L? (The acid dissociation constants of phosphoric acid are Ka1 = 7.5 × 10–3, Ka2 = 6.2 × 10–8, and Ka3 = 3.6 × 10–13)6. If 25.1 mL of 0.109M acid with a pKa of 5.27 is titrated with 0.108 M NaOH solution, what is the pH of the titration mixture after12.0 mL of base solution is added?
- Calculate the pH of a buffer in which [HC4H7O2] = 0.36 M and [C4H7O2 –] = 0.31 M. How do you calculate pKa acid dissociation constant？？What will be the appropriate pH of a buffer prepared by mixing 100 ml of 0.1 M Na2HPO4 and 100 ml of 0.1 M NaH2PO4? (For H3PO4, pKa1 = 2.1; pKa2 = 6.8; pKa3 = 12.5) Ans in 2 significant figuresCalculate the pH of buffer system with 0.25 M C6H5NH3 and 0.31 M C6H5NH3+.Ka of anilinium ion = 2.5 x 10^-5
- How many mL of 0.600 M NaOH should be added to 5.38 g of carbonic acid (H2CO3, FW = 60.02) (pKa1 = 6.351, pKa1 =10.329) to give a buffer with pH = 9.50 when diluted to 250 mL?1. A buffer solution of 0.1 M concentration with a buffering zone of 3.74-5.74 pH value , specify what would be the best pH value of this buffer, and why.(The pKa value of acetic acid is 4.74)the 1.00 L buffer solution is 0.150 M in HC7H5O2 and .250 M in LiC7H5O2. calculate the pH of the solution after the addition of 100.0 mL of 1.00 M HCl the Ka for HC7H5O2 is 6.5 x 10^-5
