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washing soda, Na2CO3-10H2O, is often used to soften hard water; to remove the hardening ions. assuming hardness is due to Ca^2+, the CO3^2- ion precipitates the Ca^2+.
How many grams and pounds of washing soda are needed to remove the hardness from 500 gallons of water that has a hardness of 150 ppm CaCO3?
Which of the following pairs has about the same atomic radius?
The addition of H2 to C=C double bonds is an important reaction used in the preparation of margarine from vegetable oils.
What mass of NaOH is needed to precipitate the Cd2+ ions from 44.0 mL of 0.500 M Cd(NO3)2 solution?
Draw the major organic product of the reaction. Indicate the stereochemistry via wedge/dash bonds, including explicit H and D atoms
PCl5 + 4H2O > 5HCl +H3PO4. How many total moles of acid are formed when starting with 4.5 g of PCl5 and excess H2O.
find the molar mass of the unknown. 16.6 degrees C freezing point acetic acid and 3.90 degrees C*kg/mol?
Suppose that each of the following pairs of compounds are being used as reactants in this experiment. Draw structures of the intermediate imines formed,
A solution is prepared by dissolving 159 g of sucrose (C12H22O11) in 624 g of water. What is the vapor pressure of this solution at 30°C? (The vapor pressure of water is 31.8 mmHg at 30°C.)
if potassium bromide of 25.5 grams is dissolved in enough H 2 O to make 1750 mL of solution, determine the molarity of the solution?
How much heat is evolved when 233 g of ammonia gas condenses to a liquid at its boiling point?
There are two key concepts to keep in mind throughout the exercises: 1) What is the unit cell for each structure? 2) What are the coordination environments of the atoms involved?
How do old dispersive infrared (IR) instruments use a grating to separate the infrared source by wavelength before passing through the sample?
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