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16.Hypochlorous acid, HOCI, is a weak acid that is found in household bleach. It is made by dissolving chlorine gas in water 2H0,) â Cl2(g) + H30'(aq) + HOCl(aq) a) Calculate the pH and the percent dissociation of a 0.065 mol/L solution of hypochlorous acid. (4.36, 0.067%) b) What is the conjugate base of hypochlorous acid? What is its value for K,? (3.44x107)

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Butanoic acid , HC4H7O2 , is a weak acid . The acid dissociation constant , Ka, is (1.5*10^-5 ) .

a) Calculate the [H⁺] of a 0.42-molar solution of HC₄H₇O₂.

b) Write the balanced net ionic equation for the reaction that occurs NaC₄H₇O₂ is dissolved in water and calculate the numerical value of the equilibrium constant for this reaction.

c) Calculate the pH of a solution made by combining 40.0 milliliters of 0.42-molar HC₄H₇O₂ and 5.00 milliliters of 1.68-molar NaOH.

d) How many grams of solid NaC₄H₇O₂ must be added to 50.0 milliliters of 0.800-molar HC₄H₇O₂ to obtain a buffer solution that has a pH of 4.82? Assume that the addition of the solid NaC₄H₇O₂ results in a negligible change in volume.

e) Household bleach is made by dissolving chlorine gas in water , as represented below.

Cl₂(g) + H₂O -> H+ Cl^- + HOCl(aq)

- Note that this reaction is not an equilibrium reaction. It does go to completion.

Calculate the pH of such a solution if the concentration of HOCl in the above solution is 0.005 molar. (ignore any equilibrium reactions that result from the partial dissociation of HOCl).

mauveelephant119

Strong base is dissolved in 715 mL of 0.400 M weak acid (Ka = 4.38 Ã 10-5) to make a buffer with a pH of 4.01. Assume that the volume remains constant when the base is added. HA(aq) + OH^- (aq) -->H2O(l) + A^-(aq)
A.) Strong base is dissolved in 715 mL of 0.400 M weak acid (Ka = 4.38 Ã 10-5) to make a buffer with a pH of 4.01. Assume that the volume remains constant when the base is added. HA(aq) + OH^- (aq) -->H2O(l) + A^-(aq)
A. )I found the PKA, which is 4.36 and the mol of HA is .286.
B.)When the reaction is complete, what is the concentration ratio of conjugate base to acid? [A-]/[HA]=?
C.)How many moles of strong base were initially added? moL[OH-]= ?

Need help with part B and C