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Question- Which of the following mixtures are buffers and why?
If it is a buffer, write an equilibrium equation for the conjugate acid/base pair.
a. KF / HF
b. NH3 / NH4Br
c. KNO3 / HNO3
d. Na2CO3 / NaHCO3
Illustrate structures to show your efforts.
Draw 2 resonance structures for the anion -CH2CHO formed from ethanol. Show all valence electrons as bonds or lone pairs and indicate any formal charges.
what is the pH of a buffered system made by dissolving 17.42 g of KH2PO4 and 20.41 g of K2HPO4 in water to give a volume of 200.0 mL?
Question about Thermochemistry, Consider the reaction: H2(g) + Cl2(g) yields 2HCl(g) Change Heat = -184.6
when answering include an explanation balanced chemical equations andor calculations where appropriate.a 0.481 gram
A calorimeter temperature increased by 0.45 0C after adding 30 joule OF ENERGY TO IT BY ELECTRICAL HEATING and the temperature increased by 7.3 0C when 0.10 grams of HCl is neutralize in the same calorimeter now determine the specific heat of neut..
Light impinges on a 1485 line per mm diffraction grating at an angle of incidence of 39.5 degrees. What wavelength, in nm, will be reflected in the first order at an angle of 14 degrees on the other side of the normal to the grating.
Phosphorus-32 has a half-life of 14.0days . Starting with 6.00g of 32p , how many grams of phosphorous will remain after 42.0days.
What mass of water in grams is contained in 2.9 L of the vapor above this solution at 55 degree C. The vapor pressure of pure water 55 degree C is 118 torr. (Assume a van't Hoff factor of 1.9 for NaCl)
For the reaction what is the cell potential at 25 if the concentrations are 0.653 , 0.173 , and 0.852 and the pressure of is 6.80
a how many moles of sodium benzoate must be added to 2.5 l of .15 m benzoic acid to form a buffer whose ph is 4.46?
the specific heat of compound a is 0.50 calg degrees celsius. what amount of heat has been added to 100.0 g of compound
A certain second-order reaction ( B--> product) has a rate constant of 1.50×10?3 M-1*S-1 at 27C and an initial half-life of 214s. What is the concentration of the reactant B after one half-life
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