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A 50.00ml solution of the acetylsalicylic acid HC9H7O4 is titrated with 0.1000 M KOH. It needed 22.08 ml of KOH to reach the equivalence point of the titration. Ka = 3.0x104
(a) Explain what is the initial concentration of the acid, HC9H7O4?
(b) Compute the pH of the solution at 10.00 ml KOH added.
(c) Compute the pH of the solution at the equivalence point.
(d) Compute the pH of the solution at 30.00 ml of KOH added.
NH3 is a weak base (Kb = 1.8 × 10-5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.049 M in NH4Cl
The binding energy of electrons to copper metal is 389.3 kJ/mol. What is the longest wavelength of light that will eject electrons from copper metal? Enter units.
When a 8.37-g mixture of methane, CH4, and ethane, C2H6, is burned in oxygen at constant pressure, 445.8 kJ of heat is liberated. What is the percentage by mass of CH4 in the mixture
oxygen gas is collected over water at 25 degrees C. The total pressure of the gas is 780.00 mm Hg. What is the partial pressure of the dry oxygen gas?
2HI(g)------H2(g)+I2(g) Kc=0.0200 at 745 K suppose 1.00 mol HI9g) and 1.00 mol H2(g) are placed in a 10.0 L Flask and heated to 745 K. What are the concentration of each substance when equilibrium is reached
Which of the following statements best explains why phospholipids differ from triacylglycerols (TAGS) a. Phosphorus replaces the oxygen atoms in the ester linkage.
Calculate the molarity if 14.5 g of NaOH was dissolved in enough water to give 360 mL of solution.
A solution of dimethylamine/dimethylammonium buffer contains 0.246 M (CH3)2NH and 2.09 M (CH3)2NH2Cl. Calculate the pH of the solution. Round your answer to 3 significant digits. Kb= 5.1x10^-4 (CH3)2NH(aq) + H2O(l) = (CH3)2NH2+(aq) + OH-(aq)
if a 210 mg piece of gold density19.32 bcm3 is hammered into a sheep measuring 2.310 ft. what is the average thickness
a. Provide equation for the complete combustion of ethylbenzene. b. Provide an equation for the partial combustion of acetylene. c. If 100 kg o both material where available, which hydrocarbon (ethylbenzene or acetylene) would produce the most wat..
Given the following thermochemical equation, calculate the heat (in kJ) involved in decomposing 18.0 g of water to give one mole of (g). 2H2 + O2 ---> 2H2O change in heat is -571.6 Kilojoules a. 286 b. 572 c. 1143 d. -572 e. -286
Give the products (if any) expected from the treatment of each of the following compounds with ozone followed by dimethyl sulfide.
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