One of your friends who likes gardening is attempting to make a solution that will increase some trace nutrients while also making the soil less acidic.* The planned solution will have the following concentrations: 0.03 M NaOH 0.008 M CaCl2 8 x 10-12 M Fe(NO3)2 You're going to help your friend out by checking to see if anything will precipitate out of this solution. Your friend is particularly worried about Ca(OH)2 [Ksp = 6.5 x 10-6] and Fe(OH)2 [Ksp = 7.9x10-16]. Your friend thinks they have done the math correctly so that no precipitates will form, but they don't know anything about ionic strength corrections.(NOTE: Assume molality = molarity. There's probably not much of a difference.) a) Calculate the ionic strength of the solution. b) Calculate the activity of hydroxide ions, aOH- c) Calculate the activity of Ca2+ ions. d) Calculate the activity of Fe2+ ions.
One of your friends who likes gardening is attempting to make a solution that will increase some trace nutrients while also making the soil less acidic.* The planned solution will have the following concentrations:
- 0.03 M NaOH
- 0.008 M CaCl2
- 8 x 10-12 M Fe(NO3)2
You're going to help your friend out by checking to see if anything will precipitate out of this solution. Your friend is particularly worried about Ca(OH)2 [Ksp = 6.5 x 10-6] and Fe(OH)2 [Ksp = 7.9x10-16]. Your friend thinks they have done the math correctly so that no precipitates will form, but they don't know anything about ionic strength corrections.
(NOTE: Assume molality = molarity. There's probably not much of a difference.)
a) Calculate the ionic strength of the solution.
b) Calculate the activity of hydroxide ions, aOH-
c) Calculate the activity of Ca2+ ions.
d) Calculate the activity of Fe2+ ions.
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