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A) The pKa values for oxalic acid, H2C2O4 are: 1.23 and 4.19respectively. Write each equilibrium acid dissociation reaction with water with its respective Ka value.
B) Write the equilibrium base reaction with water for each conjugate bases in the reactions in part a and include each respective Kb value.
A student mixes 175.0 grams of water at 62.31oC in a coffee-cup calorimeter with 175.0 grams of water at 25.84oC. The final temperature of the mixture is 41.71oC.
The smallest atoms can themselves exhibit quantum mechanical behavior. Calculate the de Broglie wavelength (in pm) of a hydrogen atom traveling 475 m/s
A 350.0 gram sample of copper is initially at 25.0 °C. It absorbs 12.50 kJ of heat from its surroundings. What is its final temperature, to the nearest tenth of a degree?
The two new DNA molecules formed in replication. The nucleotides in the backbone of DNA are held together by bonds.
the electron in the n=5 level of a hydrogen atom emits a photon with a wavelength of 1280 nm. To what energy level does the electron move?
Suppose you take a 25.00 mL sample of this hydrochloric acid solution. You then titrate it with a 0.1477 M sodium hydroxide solution.
At 25o C, the solubility of magnesium hydroxide Mg(OH)2 in water is 0.00429 grams per Liter. Calculate the Ksp for the compound. [NOTE that there are two moles of OH- per mole Mg(OH)2.]
Solid sodium peroxide (Na2O2) reacts with liquid water yielding aqueous sodium hydroxide and oxygen gas. How much heat is released
write an equation to represent the dissociation of na2so4 into ions in an aqueous solution. 5.3 grams of na2so4 are
The electron is at a distance of about 6.3 x 10-11 m from the nucleus. Assuming the hydrogen atom is a sphere with a radius of 6.3 x 10-11 m, find (a) the volume of the atom, (b) the volume of the nucleus, and (c) the percentage of the volume of t..
What is the chemical formula of the salt produced by neutralization of sodium hydroxide with sulfuric acid
copper-64 is used to study brain tumors. assume that the original mass of a sample of copper-64 is 26.00g. After 64 hours, all that remains is 0.8125g of copper-64. What is the half-life of this radioactive isotope?
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