buffer NH3 and NH4Cl add HCl what is the pH

I am really having problems with this problem: Calculate the pH of the 0.20 M NH3 and 0.15 NH4Cl buffer. What is the pH of the buffer after the addition of 10.0 mL of 0.10 M HCl to 57.5 mL of the buffer. The first part was fair enough, I got 9.35 pH, which is correct. The set up of the second part is tripping me up, I can't ...continues

given diprotic acid with ka1 and ka2, which combo and calc. pKa

A diprotic acid, H2A, has the following ionization constants: Ka1 = 1.1E-3 and Ka2 + 2.5E10-6. In order to make up a buffer solution of pH 5.80, which comination would you choose, NaHA/H2A or Na2A/NaHa? What is pKa of the acid component? I don't understand this problem at all!!! I know that a diprotic substance has something ...continues

given solubility M3X2, find Ksp for the compound

The solubility of an ionic compound M2X3 (molar mass = 330 g) is 3.9E-17 g/L. What is Ksp for the compound?

Perfect (ideal) gases (4 part question)

Suppose your balloon has a radius of 3 m and that it is a spere when inflated. a.) how much H is needed to inflate it to a pressure of 1 atm at an ambient T of 25 celsius @ sea level? b.) what mass can the balloon lift @sea level, where the density of air is 1.22 kg m^-3 ? c.) what would be the payload if helium were used ins ...continues

Boltzman distribution, rotational state, Jmax as a function of termperature

Using the Boltzmann distribution given below, determine Jmax (quantum number of the most intensely populated rotational state) as a function of temperature. Then find Jmax for CN+ at 298 K and 1100 K. and CN+ bond length is 0.129 nm the Boltzman distribution: (Ni/N)= (exp(-ei/KT))/(sigma j exp(-Ej/KT)) i tried very hard ...continues

vapor pressure, delta H of vap, normal boiling point

The vapor pressure of ethylene is given as a function of temperature by the equation log p = (-834.13/T) + 1.75logT-8.37* 10^-3T+5.323 Calculate delta Hvap of ethylene at its normal boiling point (-103.90C).

equilibrium dealing change in pressure?

NOBr in a 1.1 g quantity is placed in an evacuated 1 liter flask at -55 degrees C. The flask is warmed to 0 degrees C where the gaseous contents exert a pressure of 0.3 atm (all species are gaseous). At 25 degrees C, the equilibrium total pressure rises to 0.35 atm. What is Kp at 0 degrees C and 25 degreesC? What is delta H? (a ...continues

Calculate delta G; temperature; pressure

Kp is 1.0x10-3 atm-1/2 at 2000K and delta S at standard temperature and pressure = 87.864 J/K mole (delta Cp = 0) for the reaction CO2(g) yielding CO(g) + ½ O2(g) (this reaction is reversible) (a) Calculate delta G at 2000K, (b) Calculate delta G at standard temperature and pressure at 298K, and (c) Calculate the degree o ...continues

ideal gas law? free energy of mixing ...

I think the ideal gas law does not apply in this following problem because this problem is addressing a liquid. then how do i think through and do this problem? Calculate the free energy of mixing when 1 mole of liquid A is mixed with 4 moles of liquid B at 25 degrees C to form an ideal solution. What is the change in chemic ...continues

fugacity from Bethelot equation

Carbon dioxide obeys the reduced Bethelot equation reasonably well (i have attached the equation) Given Tc = 304.3K and Pc = 73.0 atm, calculate the fugacity of carbon dioxide at 150 degrees C and 50 atm.