When equal molar amounts of these sets of compounds are mixed in aqurous solutio

Question

When equal molar amounts of these sets of compounds are mixed in aqurous 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 0.100 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 species in a 0.25 M aqueous aolution of phosphoric acid, H_2PO_4? H_2PO_4 H_2PO_4^- HPO_4^2- H_2O^- 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_3(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,. What mass of Cu is 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_4^-(aq) +3C_2O_4^2-(aq) +4OH^-(aq) rightarrow 2MnO_2(g)+6CO_2^2-(aq)+2H_2O +6 to +4 +4 to +3 +3 to +4 +3 to +6 Which species is the,ost powerful reducing agent at standard conditions? Na^+(aq)+e^- rightarrow Na(s) E^0=-2.71V Fe^2+(aq)+2e^- rightarrowFe(s) E^0=-0.45V O_2(g)+2H_2O(l)+4e^- rightarrow 4OH^-(aq) E^0=0.40V I_2(s)+2e^- rightarrow 2I^-(aq) E^0=0.54V Na(s) Fe^2+(aq) OH^-(aq) I_2(s) For this galvanic cell reaction 3HNO_3(aq)+BrO_3^-(aq) rightarrow 3H^+(aq)+3NO_3^-(aq) +Br^-(aq) the Nernst equation implies that the galvanic cell with 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(s)+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 toward the Ni electrode. Electrons flow to the Zn electrode, Na^+ ions flow toward the Zn electrode. Electrons flow to the Ni electrode. Na^+ icons flow toward the Ni electrode. Electrons flow to the Ni electrode Na^+ ions flow toward the Zn electrode.

Explanation / Answer

1. (D) NH4Cl is the salt of a weak base (NH3), so the solution is buffered.
2. (C) first calculate [h+]

[H+]= 10-PH

= 10-3.76

= = 1.73 x 10-4

= 1.73 x 10-4 / 10-2 x 100 = 1.7 %

17. i guess its (A)

18. (C) 0.150 A= 0.150 C               eq. wt= 63.5/2 = 31.75

0.150 C x 10 X 60 s = 90

90/96500 = 9.3 x 10-4

31.75 x 9.3 x 10-4 = 0.0295 g

19. (A)

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.