Suppose that you have 125 mL of a buffer that is 0.260 M in both hydrofluoric acid (HF) and its conjugate base (F-). Calculate the maximum volume of 0.400 M HCl that can be added to the buffer before its buffering capacity is lost. Please help!!
In: Chemistry
The equilibrium constant, K, for the following reaction is 10.5 at 350 K.
2CH2Cl2(g) =CH4(g) + CCl4(g)
An equilibrium mixture of the three gases in a 1.00 L flask at
350 K contains
5.12×10-2 M
CH2Cl2,
0.166 M CH4 and
0.166 M CCl4. What
will be the concentrations of the three gases once equilibrium has
been reestablished, if 0.121 mol of
CH4(g) is added to the flask?
| [CH2Cl2] | = | _________M |
| [CH4] | = | _________ M |
| [CCl4] | = | _________ M |
In: Chemistry
In: Chemistry
Chemistry of lipid oxidation?
–State specific aspects (aromas, colors) that play into this
In: Chemistry
An aqueous solution contains 0.480 M acetic acid. How many mL of 0.327 M potassium hydroxide would have to be added to 250 mL of this solution in order to prepare a buffer with a pH of 4.680?
(please explain. thank you!)
In: Chemistry
Balance each of the following half-reactions, assuming that they occur in basic solution. CH3OH(aq)?CH2O(aq)
In: Chemistry
A certain first-order reaction has a rate constant of 3.00×10−2 s−1s−1 at 21 ∘C∘C. What is the value of kk at 51 ∘C∘C if EaEaE_1 = 76.0 kJ/molkJ/mol ?
Express your answer using two significant figures.
Another first-order reaction also has a rate constant of 3.00×10−2 s−1s−1 at 21 ∘C∘C. What is the value of kk at 51 ∘C∘C if EaEaE_2 = 110 kJ/molkJ/mol ?
Express your answer using two significant figures.
In: Chemistry
Which of the following are generally required in a E2 reaction? Choose all that apply.
A. strong base
B. anti-coplanar orientation of eliminated groups
C. Primary or secondary substrate
D. Good leaving group
E. strong nucleophile
In: Chemistry
What is the molarity of a 7.48 m solution of ethanol (C2H5OH) if the density of this solution is 0.869 g/ml?
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A reaction has a rate constant of 1.22*10^-4/s at 27 0C and 0.230/s at 78 0C. Determine the activation barrier for the reaction. What is the value of the rate constant at 18 0C?
In: Chemistry
In: Chemistry
From the Fe2+ concentrations given determine the mg of Fe in the original vitamin tablet. You will need to convert ug/mL into mg of iron. You also have to consider that the original vitamin tablet sample was diluted to 250mL in a volumetric flask and then 5mL of that sample was diluted to 100mL in a volumetric flask. Please show all equations used and work done.
1. Concentration of 0.141738
2. Concentration of 0.1307058
3. Concentration of 0.1354047
In: Chemistry
In: Chemistry
Calculate the energy of the emitted photon as well as the wavelength and frequency of electromagnetic radiation emitted from the hydrogen atom when the electron undergoes the transition from n = 5 to n = 4.
In: Chemistry
A beaker with 195 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 6.20 mL of a 0.410 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740.
In: Chemistry