58. D Determine the concentration (in M) ofa solution prepared by diluting 20.0

Question

58. D Determine the concentration (in M) ofa solution prepared by diluting 20.0 mL of a 0.400 M NaCI to 250.0 mL. A. 0.160 M B. 0.0320 M C. 2.50 M D. 0.00800 M E. 0.0160 M 59. How many grams of NaCI are required to make 250.0 mL of a 4.25 M solution? A. 58.40 g B. 175.3 g C. 14.60 g D. 43.83 g E. 61.05 g 60. Which of the following is a precinitation reaction? A. Zns) +2 AgNOgag) 2 Ags) + Zn(NO3)2(aq) E. None of the above is precipitation reactions. 61. Give the net ionic equation for the reaction (if any) that occurs when aqueous solution of K,S and Fe(NO)2 are mixed. A. Kw"No,-(aq) KNO3(s) (aq) + S2-(aq) FeS(s) E. No reaction occurs. (ag) 62. Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of PbsO, and HI are mixed. 2- Pb2+(aq) + 2 1-(aq) PbI2(s) 2. E. No reaction occurs.

Explanation / Answer

58) Millimoles of NaCl = 20 x 0.4 = 8

Final volume of solution = 250 mL

=> Final concentration = 8 / 250 = 0.032 M

B) 0.0320 M

59) Moles of NaCl required = 0.25 x 4.25 = 1.06

Molar Mass of NaCl = 58.44 g / mol

=> Mass of NaCl = 1.06 x 58.44 = 61.9 g

=> E) 61.05 g

60) B) 2LiI + Hg2(NO3)2 ---> Hg2I2 + 2LiNO3

61) B) Fe2+ + S2- ---> FeS

62) C) 2H+ + SO4 2- + Pb2+ + 2I- ----> 2H+ + SO4 2- + PbI2

99) E) Trigonal Bypyramidal

100) D

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