A student is given a sample of CuSO4(s) that contains a solidimpurity that is soluble...
A student is given a sample of CuSO4(s) that contains a solid impurity that is soluble and colorless. The student wants to determine the amount of CuSO4 in the sample and decides to use a spectrophotometer. First, the student prepares a calibration graph by measuring the absorbances of CuSO4(aq) solutions of known concentrations. The graph is shown below.
a) (a) The student dissolves the entire
impure sample of CuSO4(s)CuSO4(s) in enough distilled water to make
100.mL100.mL of solution. Then the student measures the absorbance
of the solution and observes that it is 0.300.30. Determine the
concentration of CuSO4(aq)CuSO4(aq) in the solution.
b) Calculate the number of moles of CuSO4CuSO4 that were in the impure sample of CuSO4(s)CuSO4(s).
c)In addition to the number of moles of CuSO4CuSO4 calculated in part (b)(b), what other quantity must be measured in order to calculate the mass percentage of CuSO4CuSO4 in the impure sample of CuSO4(s)CuSO4(s)?
d)A particulate drawing of a single Cu2+Cu2+ ion is shown in the following box. Draw two H2OH2O molecules in the box to show the most likely orientation of H2O(l)H2O(l) molecules around the Cu2+Cu2+ ion.
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A student is given a sample of CuSO4(s) that contains a solidimpurity that is soluble...
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A student is given a sample in lab that contains one of the ions listed below. After adding a few drops of AgNO_3 solution to a portion of the unknown sample, the student got a grayish precipitate. After adding a drops o Mg(NO_3)_2 solution to another portion of the unknown sample, the student got a black precipitate, esc on these observations, the only possible ion in this student's sample is Cl^- C_2H_3O_2^- F^- S^2- SO_4^2-
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Experience teaches us that most solids are more soluble in warm water than in cold water. Does the solid utility of Mg(OH)_2 fit this pattern? Briefly explain. Cobalt chloride is used in many weather-forecasting devices. Based on your observations in the laboratory, explain how an alcohol solution of CoCl_2 could be used to predict rain. A student is studying the equilibrium described by the net ionic equation shown in Equation 18. [Cu(H_2O)_6]^2+ (aq, blue) + 4 Br^-(aq) CuBr_4^2+(aq, green) +...
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Given the following electrolytic cell: The current is discharged into the electrolytic cell containing the solution CuSO4(aq) 1.0M at 25 oC. During the operation of the cell, copper Cu(s) is deposite...
Given the following electrolytic cell:
The current is discharged into the electrolytic cell containing
the solution CuSO4(aq) 1.0M at 25 oC. During
the operation of the cell, copper Cu(s) is deposited on
one electrode and oxygen O2(g) gas is released, near the
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6H2O(l) Eo= 1.23V
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help please? this was the only other information given REPORT SHEET Determination of the Solubility-Product Constant...
help please?
this was the only other information given
REPORT SHEET Determination of the Solubility-Product Constant for a Sparingly Soluble Salt EXPERIMENT 8 A. Preparation of a Calibration Curve Initial (Cro121 0.0024 M Absorbance 5 mL Volume of 0.0024 M K Cro Total volume 1. I mL 100 mL 2. 100ML 3. 10 mL 100ml 4. 15 mL 100 ML Molar extinction coefficient for [CrO2) [Cro,2) 2.4x100M 12x1044 2.4810M 3.6810M 0.04) 2037.37 0.85 1.13 2. 3. Average molar extinction coefficient...
A student dissolves calcium carbonate solids, CaCO_3(s) in distilled water. K_sp = 5.0 times 10^-9 a) Calculate the molar solubility of calcium carbonate in distilled water. Express your answer in gram per litre b) How would the answers in a) change if the student dissolved CaCO_3 in 0.01 mol/L solution of Na_2CO_3(aq) c) The student mixes 0.0140 g of CaO solids with 0.0265 g of Na_2CO_3 solids in 1.0 L of water solids are soluble in water). Predict whether precipitate...
A student is given a sample in lab that contains one of the ions listed below. After adding a few drops of AgNO_3 solution to a portion of the unknown sample, the student got a grayish precipitate. After adding a drops o Mg(NO_3)_2 solution to another portion of the unknown sample, the student got a black precipitate, esc on these observations, the only possible ion in this student's sample is Cl^- C_2H_3O_2^- F^- S^2- SO_4^2-
A student wishes to determine the chloride ion concentration in a water sample at 25 °C using a galvanic cell constructed with a graphite electrode and a half-cell of AgCl(s) + e - Ag(s) + CI+ (aq) Eºred = 0.2223 V And a copper electrode with 0.500 M Cut as the second half cell Cu2+ (aq) + 2 e → Cu(s) Eºred= 0.337 V The measured cell potential when the water sample was placed into the silver side of the...
Experience teaches us that most solids are more soluble in warm water than in cold water. Does the solid utility of Mg(OH)_2 fit this pattern? Briefly explain. Cobalt chloride is used in many weather-forecasting devices. Based on your observations in the laboratory, explain how an alcohol solution of CoCl_2 could be used to predict rain. A student is studying the equilibrium described by the net ionic equation shown in Equation 18. [Cu(H_2O)_6]^2+ (aq, blue) + 4 Br^-(aq) CuBr_4^2+(aq, green) +...
Given the following electrolytic cell:
The current is discharged into the electrolytic cell containing
the solution CuSO4(aq) 1.0M at 25 oC. During
the operation of the cell, copper Cu(s) is deposited on
one electrode and oxygen O2(g) gas is released, near the
second electrode.
O2(g) + 4H3O+(aq) +
4e-
6H2O(l) Eo= 1.23V
Cu2+(aq) + 2e- Cu(s)
Eo= 0.34V
A. Write the direction of the flow of electrons in the
cell.
B. Write the electrolysis equation that occurs in the cell....
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help please?
this was the only other information given
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