Write the net ionic equation for the following reactions in solution.
A) Solutions of lithium chromate and barium chloride are mixed
B) Solutions of ammonium acetate and barium hydroxide are mixed
C) Solutions of Acetic acid and potassium hydrogen carbonate are mixed
In: Chemistry
Substance Q reacts according to a first order rate law with k = 5.0 x 10-5 s -1 .
a. If the initial concentration of the reaction is 1.00 M for Q, what is the initial rate of the reaction?
b. What is the rate after 1.00 hr?
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What volume of 6.00 M HNO3 is needed to make 500.0 mL of a 0.250 M solution?
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What are glycosaminoglycans, and why are sugars good candidates for molecules that fill that role
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|
When a solid dissolves in water, heat may be evolved or
absorbed. The heat of dissolution
(dissolving) can be determined using a coffee cup
calorimeter. When I type the answer, will it have to be negative? |
In: Chemistry
To prepare a solution of NaCl, you weight out 2.634 (±0.002) g and dissolve it in a volumetric flask whose volume is 100.00 (±0.08)mL. Express the molarity of the solution, along with its uncertainty, with an appropriate number of digits. [Molecular mass of NaCl, 58.443 (±0.001) g/mol].
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Calculate the pH change when 10. mL of 3.0 M NaOH is added to 500. mL of the following:
(a) pure water
(b) 0.10 M CH3COO-
(c)0.10 M CH3COOH
(d)a solution that is 0.10 M CH3COO- and 0.10 M CH3COOH
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a) Calculate the potential in the following cell (no current is flowing)
Zn|Zn2+(1.00M)|| UO2 2+(1.00M), U4+ (0.1M), H3O + (1.00M) |Pt
b) The cathode has a volume of 50 mL. What is the cell potential (no current) after adding 10 mL, 25 mL, 50 mL, and 100 mL 1M NaOH to the cathode?
c) What is the Gibbs Free Energy for the 5 cells in a) and b). What is the spontaneous reaction in each case?
In: Chemistry
This is for the verification of beer-lambert law experiment.
|
Volume of copper sulphate solution /mL |
Volume of Concentrate d ammonia /mL |
Final volume of solution /mL |
[CuSO4]/m ol dm-3 |
[CuSO4]/pp m |
[CuSO4]/mg dm-3 |
Transmit tance /% |
Absorbance |
|
0 |
25 |
25 |
101.5 |
0.006 |
|||
|
1 |
24 |
25 |
95.9 |
0.018 |
|||
|
2 |
23 |
25 |
89.9 |
0.046 |
|||
|
3 |
22 |
24 |
86.7 |
0.062 |
|||
|
4 |
21 |
25 |
81.4 |
0.090 |
Can someone show one sample example of how to determine the three ways the following concentrations can be calculated.
Original Concentration of CuSO4.5H2) = 0.1015 mol/dm3 . 25mL of this was then taken and dissolved in water up to 250mL flask.
Concentration of the ammonia= 17.64mol/L. Ammonia was not diluted.( at 600nm)
OD values for calibration? I am not too sure what that means.
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Explain in DETAILS how do EDTA displacement titration and indirect edta titrations work and the steps to do the calculation for it (How to exactly find the moles of the ion in the sample. Show an example and use numbers to show the calculations.
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In: Chemistry
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1. What is the role of condenser used in the experiment of isoteniscope method?
2. How to know the filling the air into the system is finished before taking off isoteniscope?
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Explain why the magnetic susceptibility of a transition metal complex is temperature dependent, whereas the magnetic moment of the complex is not temperature dependent.
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