|
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].
In: Chemistry
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
In: Chemistry
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.
In: Chemistry
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.
In: Chemistry
In: Chemistry
In: Chemistry
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?
In: Chemistry
Explain why the magnetic susceptibility of a transition metal complex is temperature dependent, whereas the magnetic moment of the complex is not temperature dependent.
In: Chemistry
In: Chemistry
How do you rate the acidity from highest to lowest for acids ( carboxylic acids and alcohol) ?
How do you rate nucleophilic strength ?
How do you rate the reactivity of a carbonyl receiving a backside attack?
how do you rate the boiling points of carboxylic acids, amides, esters, alcohols
rank solubility of carbaldehyde , carboxyilic acid ester in water
In: Chemistry
Give the concentration of each ion present in the solution formed by mixing together these two solutions desribed. 51.7 mL of 0.175 M Fe(NO3)3 and 23.7 mL of 0.509 M CaCl2
In: Chemistry
Can I get all of the question answered in a way that I know under which sub question the answer goes please.
Can I get all of the questions answered in a way that I know how it fits in the question. Some parts are explanations. Thank you.
Q. When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was treated with 10% aq. hydrogen peroxide, the reaction took place with the evolution of gas bubbles, and the pink solution was turned colorless. Further chemical analysis revealed that the evolved gas was oxygen, and the resulting solution contains potassium sulfate and manganese (II) sulfate; water was also formed during the same reaction. Please answer the followings:
1) Write down the balanced chemical equation for this reaction.
2) Define the type/types of the reaction; assign the oxidation number of Manganese in potassium permanganate and manganese (II) sulfate. Also, offer an explanation for the color change.
3) Write down the ions present in the solution before & after the reaction. If 100 mL 0.5 M potassium permanganate was mixed with 50 mL 2 M sulfuric acid, what will be the final pH (>7 or <7) of the solution?
4) After the completion of reaction, when evolution of gas-bubbles ceased, what will happen if an aqueous solution of sodium carbonate was added to the reaction mixture? Please write down the net ionic equation.
5) If initially 5.65 g of potassium permanganate was taken for the reaction, calculate the total mass of manganese (II) sulfate present in the solution after the completion of the reaction. What is the Manganese ion concentration of the solution (assume that the total volume of the final reaction mixture is 500 mL)?
Useful hints: hydrogen peroxide is a strong oxidizing agent and considered to be a molecular compound.
In: Chemistry
What is a “functional group” ? Explain why infrared spectroscopy can often be used to detect the presence of a functional group in a molecule
In: Chemistry