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An environmental chemist needs a carbonate buffer of pH 10.00 to study the effects of acid rain on limestonerich soils. How many grams of Na2CO3 must she add to 1.5 L of freshly prepared 0.20 M NaHCO3 to make the buffer? KA of HCO3- is 4.7 x 10-11
Calculate the potential energy of interaction between the two electrons in the helium atom when they are separated by a distance of 1 Å. Similarly, what would be the potential energy of one of these electrons if it were alone in the presence of th..
Octane has a density of 0.692g/mL at 20 C. How many grams of O2 are required to burn 1.00 gal of C8H18?
The charges of the ions in an ionic compound affect the strength of the electrostatic attraction holding that compound together. Based on ion charges, rank these ionic compounds by their expected melting points.
A 0.277 g sample of unknown monoprotic acid requires 39.21 mL of 0.1019 M NaOH to reach the endpoint.
how many grams of copper hydroxide can be prepared from 2.7 g of copper(II)nitrate and excess sodium hydroxide?
Calculate the partial pressure of ozone and the number of ozone molecules per liter of air if the tempreture and pressure were 20.0 degrees C and 758 mmHg, respectively.
How many mL of 3.00 M H2SO4 are required to react with 4.35g of solid containing 23.2 wt% Ba(No3)2
the leathal inhalation does of sarin for a 200 pound person has been determined to be .0015mg. determine the ld50 of
Write the mathematical expression for the equilibrium constant, Keq, as a function of the concentrations of the products and reactants for this reaction.
Magnesium oxide (MgO) has the rock salt crystal structure and a density of 3.58 g/cm3. Determine the unit cell edge length.
Assuming levels of atmospheric CO2 are 390 ppm CO2, what is the pH of rainwater in equilibrium with the atmosphere for the pre-industrial atmospheric CO2 concentration of 280 ppm,v.
A 130 mL stock solution contains 1.5 M CuF2. When 11 mL of the stock solution is diluted to 23 mL, what will the concentration of F- ions be?
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