You wish to prepare an HC2H3O2 buffer with a pH of 4.24. If the pKa of the acid is 4.74, what ratio for C2H3O2 -:HC2H3O2 must you use? 

Use the standard half- cell potentials listed below to calculate the ΔGO for the following balanced redox reaction at 25 OC. 2Al (s) + 3 Mg2+ (aq) à 2 Al3+ (aq) + 3 Mg (s) Mg2+ (aq) + 2 e- à Mg (s)                EO = -2.38 V Al3+ (aq) + 3 e- à Al (s)                    EO = -1.66 V

Balance the following redox reaction if it occurs in a basic solution. What are the coefficients in front of Br2 and OH- in the balanced reaction? Br2 (l) à BrO3- (aq) + Br- (aq)

Which of the following is the correct format for the GPL?

Calculate the concentration of H3O+ in a solution that contains 5.5 X 10-5M OH- at 25 ºC. Also , identify the solution as acidic, basic, or neutral. **Submit your answer in scientific notation using the following format. 5.5 X 10^-5 M

This is the net ionic equation for all…………. Hint: Write net ionic equations for weak acid + strong base, strong acid and weak base, strong acid and strong base and weak acid and weak base and find the answer.  Choose any strong/weak acid and strong/weak base

Automotive antifreeze consists of ethylene glycol, HO-CH2-CH2-OH, a nonvolatile, nonelectrolyte. Calculate the (new) boiling point when 250.0 g of ethylene glycol is dissolved in 750.0 g of water (Kb for water = 0.51 °C/m) use 1H1, 6C12 and 8O16 Hint: use ΔT = Kb X m;   m = molality = moles of solute / Kg of solvent; moles = g/MW

From a consideration of the Lewis structure (see the attached file below), what are the formal charges? Question 68.docx        N   C   O   (A)  -1   0   0  (B)  -1  +1   -1  (C)  0  0  0  (D)   0  0   -1  (E)   -2  0   +1

When a redox reaction occurs in a basic solution the H+ needs to be neutralized.  In order to do this what needs to be added?

Which numbered response lists all of the following statements that are true and no false statements? A catalyst can…….. I. make a non-spontaneous reaction spontaneous II. speedup the forward reaction and slowdown the reverse reaction III. lower the activation energy of the forward reaction IV. lower the activation energy of the reverse reaction