spectrophotometry and beer\'s law lab ! Describe how you would prepare 600. 0 mL
ID: 820141 • Letter: S
Question
spectrophotometry and beer's law lab !
Describe how you would prepare 600. 0 mL of 0. 375 M Nacl solution from 1. 800 M Nacl Describe how you would prepare 75. 00 mL of 0. 200 M sulfate ion solution, starting from a 0 115 M solution of ytterium (III) sulfate, Y2(SO4)3. What is the ytterium(III) ion concentration ion the solution prepared in part a? Answer:______ Determine the sulfate ion concentration in a solution prepared by diluting 15. 00 mL of 0. 115 M Y2(SO4)3 with 35. 00 mL of water. Answer: _________Explanation / Answer
Using the N1V1 = N2V2 concept for all the problems:
2. 1.8 x V1 = 0.375 x 600
V1 = 125 mL of 1.8 M NaCl to be added to 475 mL water
3. a) Sulphate ion conc. = 0.115 x 3 = 0.345 M
0.345 x V1 = 0.2 x 75
V1 = 43.48 mL of Y2(SO4)3 added to 31.52 mL water
b) 1 M of Y2(SO4)3 = 2 M of Y(III) ions
thus 0.2 M of SO4 ions = 0.067 M of Y2(SO4)3 = 0.134 M of Y(III) ions
4. 0.115 M of Y2(SO4)3 = 0.345 M of SO4
0.345 x 15 = N1 x 50
N1 = 0.103 M of SO4 ions
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