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1. Calculate the pH of a buffer solution made by adding 5.0g of anhydrous sodium acetate (NaC2H3O2) to 50mL of 0.100 M acedtic acid. Assume there is no change in volume on adding the salt to the acid. pKa for acetic acid is 4.7.
Buffer capacity refers to the amount of acid or base a buffer can absorb without a significant pH change. A 0.5M buffer can absorb 5x as much acid or base as a 0.1M buffer for a given pH chnage.
You are given 60mL of 0.50M phosphate buffer, pH= 6.83. The starting composition of the buffer, both in terms of concentration and molar quantity of two major phosphate species is:Concentration of HPO4^2-= 0.304MConcentration of H2PO4-= 0.196MMolar quantity of HPO4^2-= 18.2 mmolMolar quantity of H2PO4-= 11.8 mmol
a) You add 1.7 mL of 1.00 M HCL to the buffer. Calculate the molar quantity of H30+ added as HCL and the final molar quantity of HPO4^2- and H2PO4- at equilibrium?
b) What is the new HPO4^2-/H2PO4- ratio and new pH of solution? The pKa of H2PO4- is 6.64. Use henderson-hasselbach.
C) Now take a fresh 60mL of the 0.50M pH of 6.83 buffer and add 3.7mL of 1.00M NaOH. Caclulate the new pH of the solution.
A 10g sample of acetic acid HC2H3O2. was burned in a bomb calorimeter in an excess of oxygen. The temperature of the calorimeter rose from 25 C to 35.84C. If the heat capacity of the calorimeter and its contents is 13.43KJ/C, what is the enthalpy ..
When 1 gram of nitroglycern, C3H5(NO3)3, decomposes to form nitrogen gas, oxygen gas, gaseous carbon dioxide, and liquid water, 1.9 kcal of heat is evolved. How much heat is evolved per mole of gas formed in the decomposition of nitroglycerine?
Write the balanced equation for the reaction of each hydrocarbon (cyclohexane, methylcyclohexane, toluene, ethylbenzene, isopropylbenzene, and tert-butylbenzene) with bromine.
A Power plant is the main point source of SO2 emissions for a 25 km2 area. Estimate the steady-state concentration of SO2 for this area from this point source given the following temperature data. Windspeed= 5km/hr.
A solution is prepared by dissolving 12.9 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 15.00 mL sample of this stock solution is added to 53.00 mL of water.
If the mixture contained 56 grams CO2, 3.04 mol CO and 9.03 X 1023 atoms of argon, the partial pressure of argon would be about
A weak acid with the general formula of HA will react with a base, such as NaOH. Write the neutralization equation which describes the reaction.
Write the Net Ionic Equation and determine the standard potential for the reaction between permanganate and tin(II). From the potential
If the methane contained in 5.00L of a saturated solution at 25 ^circ rm C was extracted and placed under STP conditions, what volume would it occupy.
How many grams of oxygen are needed to react completely with 1290 grams of pentanone (C5H10O)?
Calculate the mass of sugar (C12H22O11) that must be dissolved in 700 g of water to prepare 20% sugar solution
How much heat in kilojoules is evolved or absorbed in the reaction of 244.0g of calcium oxide with enough carbon to produce calcium carbide?
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