Homework Answers
Precipitate will not form when Q < Ksp
ksp [ Fe ( OH )3 ] = 2.5 x
10–20
[ Fe3+ ] = 10–3 M
PH = 2
POH = 14 —2 = 12
[ OH— ] = 10–12 M
Q = [ Fe3+ ] [ OH—]3 = ( 10-3 ) x 10-36 = 10–39
since Q < Ksp precipitate will not form
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2 A water sample taken from seepage from a mine is found to have a pH...
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BACKGROUND: Synthesis of Potassium Iron
(III) Oxalate Hydrate Salt
The iron(II) ions from
Fe(NH4)2(SO4)2•6H2O
will be precipitated as iron(II) oxalate.
Fe^2+(aq) + C2O4^2-(aq) --> FeC2O4 (s)
The supernatant liquid, containing the ammonium and sulfate
ions, as well as excess oxalate ions and oxalic acid will be
decanted and discarded. The solid will then be re-dissolved and the
iron(II) ions will be oxidized to iron(III) ions by reaction with
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The...
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Introduction to Equilibrium Lab report
Please help answering the question #2 (a,b,c,d)
Thanks!
Question
Procedure
Notebook
Complex ion equilibrium 1. Formation of the complex ion: 38 a) What evidence was there that a new chemical substance had formed? b) How did the reaction change the initial iron and thiocyanate concentrations? Would the reacon av tken place ifthe proportions hadtbenhioneric raior? 2. Adding and removing reactants: a) What effecet did adding the reactants (Fe' or SCN-) have on he briumcmposition? evidence...
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Can't figure out the concentration of the complex of
solns. 10, 11, 12, 13, & 14.
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(10 pts) The graph below shows solubility vs.
pH for five solids (where solubility in M is the same as the
dissolved metal cations). These solids are hydroxides of chromium
(Cr), aluminum (Al), nickel (Ni), and iron (Fe in II and III
oxidation states; often referred to as ferrous and ferric iron).
Use this graph to answer parts a-c below.
a) Which solid is among the least soluble at pH 12 and among
the most soluble at pH 6?
b)...
3.) (Taken from General Chemistry: Principals and Modern Applications(8 Ed.) by Petrucci, Harwood L of 1.00 M NH,. How many of AgI(s) forming? and Herring) A 0.10 mol sample of AgNO,(s) is dissolved in 1.00 grams of Nal can be dissolved in this solution without a precipitate 4.) (Modified from Chemistry: A Molecular Approach, 1" Ed. by Tro) Consider a solution that is 0.024 M in Cu and 0.017 M in Fe (a) If sodium hydroxide is used to selectively...
BACKGROUND: Synthesis of Potassium Iron
(III) Oxalate Hydrate Salt
The iron(II) ions from
Fe(NH4)2(SO4)2•6H2O
will be precipitated as iron(II) oxalate.
Fe^2+(aq) + C2O4^2-(aq) --> FeC2O4 (s)
The supernatant liquid, containing the ammonium and sulfate
ions, as well as excess oxalate ions and oxalic acid will be
decanted and discarded. The solid will then be re-dissolved and the
iron(II) ions will be oxidized to iron(III) ions by reaction with
hydrogen peroxide.
2Fe^2+(aq) + H2O2(aq) --> 2Fe^3+(aq) +2 OH^ - (aq)
The...
calculate the final temperature of the water.
15. A 25.0g sample of aluminum, taken from boiling water is placed into 85.00 g of water at 23.5 °C. Calculate the final temperature of the water. 16. A 12.00 g sample of iron is taken from a beaker of water, at 98.6 °C, and placed into a 25.00 g sample of water at 19.4 °C. Calculate the final temperature of the water. 17 Con the boot of funion for wtar at the...
A water-treatment plant is designed to remove dissolved manganese (Mn2+) and iron (Fe from the water. The water is aerated to oxidize these reduced species and cause formation of a solid precipitate that can then be filtered out of the water. The reaction for Mn is If the [Mn2+] equals 25x10-6 M, pH is maintained at 7, temperature is 25°C, and the oxygen concentration is maintained at a constant value by blowiilibrated with the atmosphere into the solution, will be...
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Introduction to Equilibrium Lab report
Please help answering the question #2 (a,b,c,d)
Thanks!
Question
Procedure
Notebook
Complex ion equilibrium 1. Formation of the complex ion: 38 a) What evidence was there that a new chemical substance had formed? b) How did the reaction change the initial iron and thiocyanate concentrations? Would the reacon av tken place ifthe proportions hadtbenhioneric raior? 2. Adding and removing reactants: a) What effecet did adding the reactants (Fe' or SCN-) have on he briumcmposition? evidence...
Can't figure out the concentration of the complex of
solns. 10, 11, 12, 13, & 14.
Modern Experimental Chemistry Chemistry 153 The Iron(III) Thiocyanate Complex Purpose of the Experiment To determine the chemical formula of a complex ion and measure its formation equilibrium constant Equipment Spectro Vis spectrophotometer and LabQuest, cuvette, 25-mL buret (3), ring stand, buret clamp (2), 50-mL beaker (3), small plastic beakers Reagents SCN, as KSCN, 0.00200 M solution Fe; as Fe(NO), 0.00200 M solution and a...
Write the equilibrium-constant expression for the reaction shown in terms of [NO], [0, 1, and [NO, J. 2 NO(g) + O2(g) = 2 NO, (g) Ke, which is sometimes symbolized as Kor Key, denotes that the equilibrium constant is expressed using molar concentrations. For this question, Kmeans the same thing as K and Ke. K. = [C] [D]2 [4][B] At 25 °C, only 0.0670 mol of the generic salt AB, is soluble in 1.00 L of water. What is the...
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