Identify the percipitate in the following reaction: Zn^2+ (aq) + 4 NH3 (aq) ⇄ Zn(NH3)^2+,4(aq)
a. Zn^2+
b. NH3
c. H2O
d. Zn(NH3)^2+ 4
answer is option d. [Zn(NH3)4]2+
explanation: zinc salt and aq. ammonia react to form tetramminezinc (II) complex as precipitate due to lesser solubility in water compare to starting material
Identify the percipitate in the following reaction: Zn^2+ (aq) + 4 NH3 (aq) ⇄ Zn(NH3)^2+,4(aq) a....
Identify the Lewis acid and Lewis base in each reaction. 1) Zn2+(aq) + 4 NH3(l) ⇌ Zn(NH3)42+(aq) 2) H2O + SO3 ⇌ H2SO4 * In Reaction (1), Zn2+(aq) is the and NH3(l) is the . * In Reaction (2), H2O is the and SO3 is the .
6. Write the equilibrium expression for the reaction Zn" (aq) + 2 NH3(aq) Sny Zn(NH) (aq) a. K = [Zn**] + 2ỊNH,]+[Zn(NH, [Zn(NH,) d. K = [ZnJINH, [Znº1+ 2ỊNH,] [Zn(NH, e. K = [Zn(NH, 1-[Zn - 2(NH, J [Zn” JINH 1 c. K [Zn(NH, 1.
4) What element is undergoing oxidation (if any) in the following reaction? Zn(s) + 2 AgNO3(aq) → Zn(NO3)2(aq) + 2 Ag(s) A) N B) Zn C) o D Ag E) This is not an oxidation-reduction reaction.
The following redox reaction occurs in acidic solution: Zn(s) + VO3-(aq) ➔ Zn2+(aq) + V2+(aq) When this equation is balanced, the smallest whole-number coefficients are: Zn VO3- H2O A. 2,3,6 B. 1,1,1 C. 3,2,6 D. 1,2,3 E. 3.2.3
22. Zn + OH (a)(excess)- (aq) 23. Zn(OH)2 (s)+ H (aq) 24. Zn(a) K(a)Fe(CN) (aq) 25. Ni2 (aq) + NH3 (aq)+ H2O (until basic) - (I) Ni(OH)2 (s) + NH3 (aq) (excess) 26. 27. Ni2 (aq) + NH, (excess)- 28. Ni2 (aq)+ OH (aq) 29. Ni(OH)2 (s) + H (aq)
7. a) Identify the conjugate acid-base pairs in the following reaction: NH3(aq) + H O(l) + NHa*(aq) + OH (aq) b) The conjugate acid of HCO3 ? c) The conjugate base of H2PO4? d) Which of the following is not a conjugate acid-base pair? A) NH4+/NH3; B) H30*70H; C) H2SO3/HSO3; D) C2H3027HC2H302; E) All of the above are conjugate acid-base pairs.
Which equilibrium constant expression(s) are for the following reaction. NH3(aq)↔NH3(g) Choose from the list below and enter the letters alphabetical order. (e.g. AH) A) (pNH3)eq F) (pNH3)eq2 B) [NH3]eq G) [NH3]eq-2 C) (pNH3)eq-1 H) (pNH3)eq-2 D) [NH3]eq-1 What is the equilibrium constant expression for the following reaction: Ru2+(aq) + 6NH3(aq)↔Ru(NH3)62+(aq) Choose from the list below and enter the letters alphabetical order. (e.g. For an equilibrium constant of [NH3]6eq[Ru2+]eq enter AH.) A) [Ru2+]eq E) [NH3]-1eq I) [Ru(NH3)62+]6eq B) [NH3]eq F) [Ru(NH3)62+]-1eq...
4. Which of the following statements about the voltaic cell shown below is correct? Zn(s)[Zn** (aq)|| Cu** (aq)|Cu(s) (a) The oxidation half-reaction is clearly Zn(s) ® Zn** (aq) + 2 e. (b) The oxidation half-reaction is clearly Zn() Zn" (aq) +le. (C) The oxidation half-reaction could not be anything other than Cu(s) ® Cu (aq) +2 e. (d) It is obvious that the oxidation half-reaction is Zn(s) ® Cu(s). 5. Which of the following statements about the voltaic cell shown...
The following Lewis acid-base reaction has A.G° =-39.9 kJ. Cd2+ (aq) + 4 NH3(aq) → [Cd(NH3)4]2+(aq) What is the formation constant of [Cd(NH3)4]2+ at 25 °C? (R = 8.314510 J/Kºmol) 1. -1.0 x 107 2. 1.0 x 107 3. 1.0 x 10-7 4. 1.3 x 1016
Part A. Which of the following is not a redox reaction?
H2O(l) + NH3(g) NH4+(aq) + OH–(aq)
2H2(g) + O2(g) 2H2O(l)
Zn(s) + H2SO4(aq) ZnSO4(aq) + H2(g)
FeSO4(aq) + K2Cr2O7(aq) + 7H2SO4(aq) Cr2(SO4)3(aq) + 3Fe2(SO4)3(aq) + K2SO4(aq)
+ 7H2O(l)
Cl2(g) + 2KBr(aq) Br2(l) + 2KCl(aq)
Part B. A 43.46 mL sample of Na2SO3 was titrated with 68.99 mL
of 0.128 M K2Cr2O7 solution in the presence of H2SO4. Calculate the
molarity of the Na2SO3 solution. Enter to 3 decimal...