4. Write the expression for K, for the ionization of CH,COOH in water.
Provide a scheme of Benzoic C6H5-COOH with water (acid ionization expression). The pKa is 4.20 and the molar mass is 122.1g. Provide a scheme of Salicylic C6H4(COOH)(OH) with water (acid ionization expression). The pKa is 2.98 and the molar mass is 138.1g.
Complete the ionization reaction of butanoic acid (CH,CH,CH,COOH) in water. Include all hydrogen atoms and charges. Select Draw Rings More Erase // ICOH +H,0- HyC-CH2-CH2-C-OH + 0 2
1. Given: K. for CH,COOH - 1.8x106 50 mL of 0.1 M CH,COOH is titrated with 0.1 M NaOH (a) Write down the balanced neutralization equation: Answer: - (ii) (iii) (iv) no. of mole of CH,COOH How many mole of NaOH is needed to react with the no. of mole of CH,COOH found in (11)? From your answer in (ili), find the volume of NaOH needed to reach the equivalent point (b) What is the initial pH? (before the addition...
a. Write the reaction for a monoprotic acid HA with water and its equilibrium constant expression (K) b. Write the reaction for the conjugate base of HA with water and its equilibrium constant expression (Kb) c. Write the reaction for the auto-ionization of water and its equilibrium constant expression (Kw) d. Use the equilibrium expressions for Ka and Ko to prove that K Kb = Kw. What is the physical significance of the KaKb = Kw relationship?
Using this table of ionization constants, calculate the overall equilibrium constant, Koval CH,COOH(aq) + S?-(aq) = CH 000-(aq) + HS- (aq) Koverall = TOOLS *10'
3 marks] Question 9 a) Write the expression for the self-ionization of water [2 marks] b) State the pkw value for pure water at 25°C (2 marks] c) Describe how the concentration of ions changes if an acid were to be added to the water (4 marks] Question 10 What is the pH of a solution formed by mixing 125.0 ml of 0.0250M HCl with 75.0 ml of 0.0500M NaOH? March 2o1g Version 1.0. 14
4. Mr. Burnes bought a bottle of vinegar and wondered how concentrated the acetic acid (CH-COOH; mm = 60.05 g/mol) was inside. He titrated it with 0.00182 M NaOH that he found in a general chemistry laboratory. It took 9.90 mL of NaOH to reach the equivalence point. See titration curve on next page. A. What is the concentration of acetic acid if 23.7 mL of vinegar was used for the titration? B. Mr. Burnes bought the economy size bottle...
4, Calculate the [OH1 pH and percent ionization for a 0.2M aqueous solution of NH,. K,- 1.8 x 10 5. Calculate the [H1 and pH of a buffer solution that is 0.10 M CH,COOH and 0.20 M NaCH,COO. 6. How many grams of NH.Cl are needed to 500 mL of a buffer solution that is 0.10 M NH, with a pH of 9.15?
Question 7 Caffeine, CH 10N4O2 (aq) is a weak base. What is the value of K for caffeine if a solution at equilibrium has [C3H10N 02] = 0.050 M [C8H10N4O2H*]= 5.0 x 10-3M and [OH-] = 2.5 x 10-3M? Write the ionization of caffeine with water and write the Kb expression. Then solve for the kb.
a) Write the dissociation reaction and corresponding K, expression for CH3NHs in water 8. b) Write the reaction with water and corresponding Ko expression for aniline (CGHsNH2) 9 A typical sample of vinegar has pH of 3.0. Assuming the vinegar in only an aqueous solution of acetic acid (Ka 1.8 x 105), calculate the concentration of acetic acid in vinegar? 10. Calculate the pH of a solution that contains 1.0 M HF (K-7.2x10) and 1.0 M CHsOH (K-1.6x1010). Calculate the...