
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Consider a triprotic acid, H3A, with pKa's of 5.00, 7.50 and 10.00. What is the pH of a 0.50 M Na2HA solution?
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- The pKa of formic acid (HCO2H) is 3.75. What is the pH of a solution of 0.2 M formic acid?arrow_forwardA diprotic acid, H, A, has acid dissociation constants of K₁1 = 4.76 x 10-4 and K₁2 = 3.59 x 10-12. Calculate the pH and molar concentrations of H₂A, HA, and A2- at equilibrium for each of the solutions. A 0.205 M solution of H₂A. pH = [HA] = A 0.205 M solution of NaHA. pH= [HA] = M M [H₂A] = [A²-] = [H₂A] = [A²-] = M M M Marrow_forwardCalculate the pH of an acetic acid solution, originally 0.25 M, in water. The pKa for acetic acid = 4.76.arrow_forward
- The structure of benzene-1,2,3-tricarboxylic acid (pKa1 =2.88, pKa2 4.76, pKa3 = 7.13) can be seen on the right. What is the predominate form of benzene-1,2,3-tricarboxylic acid in a solution that has a pH of 6.0?arrow_forwardAspirin was discovered as a result of efforts to produce a derivative of salicylic acid that would not be irritating to the stomach lining. Aspirin is acetylsalicylic acid, CH3CO2C6H4CO2H The −CO2H functional group is still present but it’s acidity isreduced to Ka = 3.0 × 10^-4. What is the pH of a solution of acetylsalicylic acid with the concentration of 2.502?arrow_forwardAmmonium bromide is a weak acid with a pKa of approximately 5 in water. KNO3 is a strong base.arrow_forward
- A newly found weak acid is found to have a pH of 4.13 when an aqueous solution of 0.326 M is created. What is the pKa of this weak acid?arrow_forwardThe pKa of NaH2PO4 is 6.86. Its conjugate base is Na2HPO4. One dissolves 5.0 grams each of NaH2PO4 and Na2HPO4 in 500.0 mL of water, how many grams each of NaH2PO4 and Na2HPO4 must be dissolved in enough water to make 1.0 L of solution whose pH = 7.2? If the final concentration of NaH2PO4 is 0.1 M.arrow_forwardEnough of a monoprotic weak acid is dissolved in water to produce a 0.0105 M solution. The pH of the resulting solution is 2.38. Calculate the pKa for the acid. pka =arrow_forward
- A solution of lactic acid, HC3H5O3, on a laboratory shelf was of undetermined concentration. If the pH of the solution was found to be (2.51x10^0), what was the concentration of the lactic acid? The Ka of lacticacid is 1.4x10-4. Express your answer to three significant figures.arrow_forwardWhat is the pH of a 0.02 M solution of acetic acid (pKa = 4.84)?arrow_forwardHA is a weak acid with pKa = 6.70. What is the pH of a 1.59 M solution of HA?arrow_forward
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