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Consider the dissolution of A(OH)2 in a medium with [OH-] = 0.15 M.
- Calculate the molar solubility of A(OH)2 in this medium.
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- What of the following is the expression for the solubility product of Ba3(AsO4)2?During the course of the titration of a 20.0 ml of solution containing 0.1 M of NaOH and 0.08 M of hydrazine (NH2-NH2) (Ka = 1.05 x 10) by a 0.2 M standard perchloric acid (HC104) titrant, calculate the pH of the titration mixture after (a) 5.0 ml; (b) 10.0 ml; and (c) 15.0 ml of HC1O4 titrant is added.A student has a sea water sample which contains Ca2 ions . Describe briefly how he will determine the concentration of Ca? ion in the sample using a simple titration. Explain the colour changes at the endpoint. Which medium is suitable for performing the titration, acidic or basic medium and why?
- Consider the Gibbs energies at 25 °C. Substance AG; (kJ · mol-!) Ag*(aq) 77.1 Cl^(aq) -131.2 AgCl(s) -109.8 Br¯(aq) -104.0 AgBr(s) -96.9(vi) HCN is a weak acid with a Ka of 4.9 x 10-10. Write an equilibrium expression for this process and calculate the pH for a 0.4 mol L-1 solution of HCN.What is the solubility of NH3 if its partial pressure is reduced to 30,000 Pa?
- Consider the titration of the weak acid, benzoic acid, HC7H5O2. Its acid dissociation reaction is: HC7H5O2 (aq) + H2O (l) ↔ C7H5O2- (aq) + H3O+ (aq) A 25.00 mL sample of a solution of benzoic acid, concentration unknown, is titrated with 0.0500M NaOH solution. A plot of the titration is shown below. 1. what is the pKa (approximately) of benzoic acid? Its Ka? 2. on the plot, indicate the buffering region of the titration 3. From the pH at the equivalence point, estimate the pKb of benzoate ion (conjugate base to benzoic acid)______________[Remember, at the equivalence point, C7H5O2- (aq) + H2O (l) ↔ HC7H5O2 (aq) + OH- (aq) ]When 1.40 moles of Br2 are put in a 0.960−L flask, 1.10 percent of the Br2 undergoes dissociation. Calculate the equilibrium constant Kc for the reaction.It is found that 8.70e-09 g of Ga(OH)3 dissolves per 100 mL of aqueous solution at 25 oC. Calculate the solubility-product constant for Ga(OH)3.The Ksp of Y2(CO3)3 at 25 oC is 1.03e-31. What is the molar solubility of Y2(CO3)3?