A buffer solution contains acetic acid (HC_2H_3O_2) at a concentration of 0.225
ID: 998654 • Letter: A
Question
A buffer solution contains acetic acid (HC_2H_3O_2) at a concentration of 0.225 M and sodium acetate (NaC_2H_3O_2) at a concentration of 0.164 M. The value of K_a for acid is 1.75 Times 10^-5. What is the pH of these buffer solution? 0.137 0.862 2.40 4.62 4.76 Formic acid (HCO_2H) is a weak acid found in the venom of bees and ant stings. Which of the following is an accurate statement concerning an aqueous solution of formic acid? HCO_2H(aq) + H_2O(l) H_3O^+ (aq) + HCO_2^- (aq) K_s = 1.8 Times 10^-4 The reaction between formic acid and water is slow, due to the low value for K_a. A formic acid solution predominantly contains undissociated HCO_2H molecules. A formic acid solution predominantly contains H_2O^+ and HCO_2^- ions. A formic acid solution contains a greater concentration of dissolved ions than it does neutral formic acid molecules. A formic acid solution contains equal amounts of H_3O^+ and HCO_2H. HCL is a strong electrolyte. A bottle of HCl contains the label 0.015 M HCl (aq). Which statement concerning this HCl solution is FALSE? The solution is acidic. The pH of the solution is 1.5. The hydronium ion concentration in this solution is 0.015 M. The solution has a higher concentration of hydronium ions than hydroxide ions. The solution contains dissolved H_3O^+ and Cl^- ions only; no HCl molecules are present. The species that remains after an acid donates a proton is called is conjugate base. What is the conjugate base of the hydronium ion, H_3O^+? OH^- H_2O^- H_2O H_2O^+ H_3O^+ has no conjugate base. Which of the following is an example of a diprotic acid? NH_2^- H_2SO_4 HCl CH_4 Both A and B are correct. A buffer solution contains carbonic acid (H_2CO_3) and solution bicarbonate (NaHCO_3), each at a concentration of 0.100 M. The relevant equilibrium is shown below. What is the pH of this buffer solution? H_2CO_3(aq) + H_2O(l) H_3O^+ (aq) + HCO_3^- (aq) K_1 = 4.5 Times 10^-7 4.50 7.00 6.35 7.65 7.65 2.16 What is the general term used to describe what is happening in the half reaction shown below? F_2 + 2e^- 2F^- oxidation reduction decomposition combustion Both A and B are correct.Explanation / Answer
27) pH = pKa + log [Base] / [Acid] = 4.75+ log (0.164/0.225) = 4.62; answer is D)
28) The dissociation of formic acid is very slow as it is having less Ka values. Hence answer A) is correct.
29) Option B) is wrong as pH= -log [H+] = - log(0.015) = 1.8
30) H2O (option-C is correct answer)
31) A diprotic acid in which there are two polarizable protons present.
32) at equimolar concentrations, pH = pKa, hence pH = pKa = -log Ka = -log (4.5*10-7) = 6.35 (option C)
33) Its a reduction as it is gaining or electrons. (option B) is correct.
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