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Phosphate buffer is a commonly used buffer for biological experiments. The buffer is made by combining H2PO4- (pKa = 7.21) and HPO42-. a) How much KH2PO4 (MW= 136.1 g/mol) and K2HPO4 (174.2 g/mol) would you need to make 300 ml of 50 mM phosphate buffer at pH 7.35? b) You then add 8 ml of 1 M HCl to the buffer you made in a), what is the final pH after the addition of the acid? c) You are interested in making 1L of 75 mM phosphate buffer pH 7.4. You have a starting solution of 1 M H2PO4- and a 0.5 M solution of HCl. Describe how you would make this buffer.
The temperature of the calorimeter increased from 25.4 to 40.2 degrees C. The specific heat is 4.184J/gC and the calorimeter constant is 289 J/C. Determine the specific heat of the glass beads.
A sample of K2S contains 1.35 g of potassium. How many moles of potassium sulfide are present in the sample
The shorthand notation for the galvanic cell reaction Fe3+(aq) + 2 I-(aq) ? Fe2+(aq) + I2(s) requires an inert electrode on A) only on the right side of the salt bridge
How many grams of CaH2 are needed to generate 147 L of H2 gas if the pressure of is 824 torr at 295K ?
A sample of propane,C3H8, contains 10.8 moles of carbon atoms. How many total moles of atoms does the sample contain?
The activation energy of a certain reaction is 52.9 kJ/mol. How many times faster will the reaction occur at 35 degrees C than at 25 degrees C
The atomic weight of a newly discovered el- ement is 110.352 amu. It has two naturally occuring isotopes. One has a mass of 111.624 amu.
Calculate the standard enthalpy of combustion. The standard enthalpy of formation of palmitic acid - 208kJ/mol
The mass percent composition of the compound is 53.31% C, 11.19% H, and the rest is O. What is the molecular formula of the compound
A student was using the concentrations of pipet calibration data listed in the Background Information for the determination of ka or propionic acid. Explain the problem the student encountered when preparing the following equilibrium mixture.
If you have a 750 ml flask that contains 1.235g of C5 H11 NO3 that is heated to 118.5 degrees C what is the pressure inside the flask
The viscosity of H2 at 0 degrees celsius and 1 atm is 8.53 uPa s. Find the viscosity of D2 at 0 degrees celsius and 1 atm
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