When equal molar amount of these sets of compounds are mixed in aqueous solution

Question

When equal molar amount of these sets of compounds are mixed in aqueous solution, which will form a buffer solution? HCL with NaCl HCl with NaOH NaOH with Na_2CO_3 NH_3 with NH_4Cl The pH of a 0.0100 M solution of a weak acid, HA is 3.76. What is the percent ionization of HA for this solution? 0.017% 0.58% 1.7% 5.8% Which is the most prevalent specie in a 0.25 M aqueous solution of phosphoric acid, H_3PO_4? H_3PO_4 H_2PO_4^- HPO_4^2- H_3O^- Which titration has an equivalence point with a basic pH? titrating NH_3(aq) with HCl(aq) titrating HNO_3(aq) with KOH(aq) titrating HNO_2(aq) with KOH(aq) titrating HClO_4(aq) with Ca(OH)_2(aq) Which figure best represents a concentrated aqueous solution of HI? (Water molecules are not shown.) A current of 0.150 A is passed through an aqueous CuSO_4 solution for 10.0 minutes plated out? (Assume 100% yield.) 0.000494 g 0.0592 g 0.0296 g 0.0148 g The oxidation number of carbon changes from________is this redox reaction: 2MnO_6^-(aq) + 3C_2O_4^2-(aq) + 4OH^-(aq) rightarrow 2MnO_2(s) + 6CO_7^2-(aq) + 2H_2O +6 to +4 +4 to +3 +3 to +4 +3 to +6 Which species is the most powerful reducing agent at standard conditions? Na^-(aq) + c^- rightarrow Na(s) E^= -2.71 V Fe^2+(aq) + 2e^- rightarrow Fe(s) E^= -0.45 V O_2(g) + 2H_2O(I) + 4e^- rightarrow 4OH^-(aq) E^= 0.40 V I_2(s) + 2e^- rightarrow 2I^-(aq) E = 0.54 V Na(s) Fe^2+(aq) OH^-(aq) I_2(s) For this galvanic cell reaction 3HNO_2(aq) + BrO_3^-(aq) rightarrow 3H^+(aq) + 3NO_3^-(aq) + Br^-(aq) the Nernst equation implies that the galvanic cell will have a more negative voltage if you. Increase the pH. decrease the Br^- concentration. Increase the BrO_3^- concentration. Increase the NO_3^- concentration. The reaction Zn(3) + Ni^2+(aq) rightarrow Zn^2+(aq) + Ni(s) occurs in the galvanic cell shown. Which statement is true? Electron flow to the Zn electrode. Na^+ ions flow towards the Ni electrode. ? Electron flow to the Zn electrode. Na^+ ions flow towards the Zn electrode. ? Electron flow to the Ni electrode. Na^+ ions flow towards the Ni electrode. ? Electron flow to the Ni electrode. Na^+ ions flow towards the Zn electrode.

Explanation / Answer

13. When NH3 and NH4Cl are added to water, it will form buffer.

14. HA = H+ + A- ; [H+] = Ka[HA]/[A-] ; [H+] = [A-]= Cinitial [Alpha]

so (Cinitial [Alpha])= [H+] ; From pH , [H+]= 10-3.76 =1.7378 *10-4

so (Cinitial [Alpha])=1.7378 *10-4; [Alpha]= 1.7378 *10-4/ 0.01= 1.7378 *10-2 = 1.74% option c.

16. tritration of weak acid by strong base gives equivalence point with basic pH.

So Trutratung HNO2 with KOH gives equivalence point with basic pH.

18.quantity of charge = rate of flow of charge × time ; Q= I x t= 0.15*10*60=90 C.

1F=96500C= 1mole of cu should be deposited; so for 90 C , 90/96500= 9.33 *10-4 mole of Cu should be deposited. so wieght of Cu= 9.33 * 10-4 * 63.55=0.0592 g. option b.

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