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When cooncentrated CaCl2 (aq) is added to Na2HPO4 (aq), a white ppt forms that is 38.7% Ca by mass. Write a net ionic equation to represent the probable reaction that occurs (Hint: What is the probable calcium-containing product?)
that of the Ce(III)/Ce(IV) system is +1.44V, calculate the potential at the following points during the titration of 100 ml of 0.05M Fe(II) with 0.05M cerium (IV)
septic tank has a pH of 6.90 and HCO3- concentration of 8.25 mmol L-1. Calculate the partial pressure of carbon dioxide in the associated soil atmosphere.
What would the pH of a raindrop be if the concentration of CO2 increases to 600 ppm at 20 degrees C? Show all steps.
the structure they gave me already has two nonbonding electrons on Bromine with no formal charge
Assume that the electrode follows the Nernst equation, the temperature is at 25°C, and that the activity coefficient of X is 1.
Iodine-131 is a radioactive isotope. After 7.00 days, 54.7% of a sample of 131I remains.
When an ion-selective electrode for X was immersed in 0.0680 M XCl, the measured potential was 0.0400 V. What is the concentration of X when the potential is 0.0550 V
A gas mixture with a total pressure of 765 contains each of the following gases at the indicated partial pressures: , 118 ; , 229 ; and , 187 . The mixture also contains helium gas. What is the partial pressure of helium gas.
Aminotransferases are enzymes that catalyze the interconversion of amino acids and ?-keto acids. In this way, they can provide the carbon needed for gluconeogenesis from amino acids supplied by dietary protein
An indicator has a pKa of 5.7 . It is colorless in acid solution and deep green in alkaline solution.
How many metric tons of 5%-S coal would be needed to yield the H2SO4 required to produce a 2.5-cm rainfall of pH 2.00 over an area of 100 square kilometers?
If at a given moment O2 is reacting at a rate of 0.317 mol/L s, what is the rate of formation of H2O?
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