Calculate the percent ionization of a 0.175 M hypobromous acid in pure water and in a 0.125 M potassium hypobromite solution. Explain (using a few sentences) why the percent ionization is different. The ionization constant for hypobromous acid is 2.8 x 10-9.
In: Chemistry
Calculate the pH at the equivalence point in titrating 0.047 M
solutions of each of the following with 0.019 M NaOH.
(a) hydrochloric acid (HCl)
pH =
(b) boric acid (H3BO3), Ka =
5.8e-10
pH =
(c) arsenous acid (H3AsO3), Ka =
5.1e-10
pH =
In: Chemistry
Mass of Zinc = 0.0928 g
H2 volume reading from the eudiometer tube = 35.98 mL
Water bath temperature = 19.9 °C
Barometric pressure = 768.2 mm Hg
Level (pressure) difference from the meter stick = 41.20 cm H2O (Pay attention to this unit!)
Note: to calculate the vapor pressure of water from the temperature given above, use the equation provided in Part 1 of the procedure.
b.) After completing your work on paper, record your answers below:
Vapor pressure of water =
Level difference in mm Hg =
H2 partial pressure =
H2 volume at STP =
H2 moles =
H2 molar volume at STP =
Before clicking on "Submit," verify that all your units are in place and that your significant figures / digits of precision are correct.
In: Chemistry
what is the rate determining step?
it is not 1-2 | |
Instructions |
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In: Chemistry
If you excite a fluorescent sample with light of 310 nm, in addition to the peaks from the light emitted by the molecule of interest, at what other wavelengths (in nm) would you expect to see peaks in the spectrum? Why?
In: Chemistry
The hydrolysis of the sugar sucrose to the sugars glucose and fructose, C12H22O11+H2O⟶C6H12O6+C6H12O6 follows a first-order rate law for the disappearance of sucrose: rate = k[C12H22O11] (The products of the reaction, glucose and fructose, have the same molecular formulas but differ in the arrangement of the atoms in their molecules.) (a) In neutral solution, k = 2.1 × 10−11 s−1 at 27 °C and 8.5 × 10−11 s−1 at 37 °C. Determine the activation energy, the frequency factor, and the rate constant for this equation at 47 °C (assuming the kinetics remain consistent with the Arrhenius equation at this temperature). (b) When a solution of sucrose with an initial concentration of 0.150 M reaches equilibrium, the concentration of sucrose is 1.65 × 10−7 M. How long will it take the solution to reach equilibrium at 27 °C in the absence of a catalyst? Because the concentration of sucrose at equilibrium is so low, assume that the reaction is irreversible. (c) Why does assuming that the reaction is irreversible simplify the calculation in part (b)?
In: Chemistry
Calculate your individual fluid needs in cups per day. How did you arrive at your answer? Why is hydration so important to our survival? What is effect of electrolytes on your water intake ?
what happens when we drink too much water or too much alcohol? what happens to the body? How do we recover after an incident? What are scenarios and importance of electrolytes?
In: Chemistry
THERMODYNAMIC PROPERTY RELATIONS
1. Derive expressions for (a) ∆u, (b) ∆h, and (c) ∆s for a gas that obeys the van der Waals equation of state for an isothermal process.
2, Estimate the specific-heat difference cp - cv for liquid water at 15 MPa and 80°C.
In: Chemistry
#18.37 Balance each of the following redox reactions occurring in acidic aqueous solution.
A) Cd(s)+Cu+(aq)→Cd2+(aq)+Cu(s)
B) I−(aq)+SO42−(aq)→H2SO3(aq)+I2(s)
In: Chemistry
Select all of the correct statements about
equilibrium from the choices below.
At equilibrium the rates of forward and reverse reactions are
equal.
As a reaction proceeds forward toward equilibrium the product
concentrations rise.
At equilibrium no more reactants are transformed into
products.
As a reaction proceeds forward toward equilibrium the forward rate
drops.
At equilibrium the rate of change of reactant concentration is
zero.
At equilibrium all reactions stop.
In: Chemistry
One of the assumptions of the kinetic molecular theory is that there are no intermolecular forces (attractive or repulsive) between gas particles (atoms or molecules). How would the presence of intermolecular forces affect the ideal gas equation (PV = nRT)? Again, in your response, please use terms that a high school senior who hasn’t taken AP chemistry might use.
In: Chemistry
Predict the number of d-electrons AND number of unpaired electrons on the metal in each of the following complexes (explanations helpful!):
1. [Cr(H2O)4F2]
2. [Rh(en)3]3+
3. [Pt(CN)4]2-
4. [TiCL4]3-
In: Chemistry
In a Mohr titration of chloride with silver nitrate, an error is made while preparing the indicator. Instead of 0.011 M chromate indicator in the titration flask at the endpoint, there is only 0.0011 M. If the flask contains 100 mL at the end point, what is the error in the titration in milliliters of 0.100 M silver nitrate?
.
In: Chemistry
1)Consider the formation of hydrogen
fluoride:
H2(g) + F2(g) ? 2HF(g)
If a 2.8 L nickel reaction container (glass cannot be used because
it reacts with HF) filled with 0.0085 M H2 is connected
to a 3.6 L container filled with 0.030 M F2. The
equilibrium constant, Kp, is 7.8 x
1014 (Hint, this is a very large number, what
does that imply?)Calculate the molar concentration of HF at
equilibrium.
2)Suppose a 5.00 L nickel reaction container filled with 0.0052 M H2 is connected to a 3.00 L container filled with 0.287 M F2. Calculate the molar concentration of H2 at equilibrium.
In: Chemistry