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A buffer is prepared by adding 9.00 g of ammonium chloride (NH4Cl) to 260 mL of 1.00 M NH3 solution. Write the complete ionic equation for the reaction that occurs when a few drops of nitric acid are added to the buffer.
Tween-20 is a detergent that is often used in immunological assays. Concentrated Tween-20 a viscous liquid and is difficult to accurately pipette in small amounts. Because of thism it is common to make a 10% stock of Tween 20 i nwater and use this..
How many mL of 0.380 M solution can be prepared by dissolving 4.00g of Ca(OH)2 in water?
A student dissolves 1.50g of copper(II) nitrate in water. After adding aqueous sodium carbonate solution which contains 1.80g of sodium carbonate, the student obtains 0.875g of CuCO3 precipitate.
If 60.0 g of H3PO4 is dissolved in enough water to form 175 mL of solution, what is the molarity (M) of the solution?
Using a stock solution of 95.4ppm MgCO3, you are directed by your instructor to make calibration standards of 1.0, 7.5, and12.0 ppm. If you use 100mL volumetric flasks to make the solutions, what volume of stock solution will you require for each ..
Calculate the amount of heat (calories) absorbed when 50.0g of water at 20deg. Celsius spreads over your skin and warms to body temperature, 37deg. celsius.
Did an experiment williamson ether synthesis with sodium ethoxide and 1-bromobutane forming 1-ethoxybutane and NaBr. The 1H NMR showed an impurity
Write net Bronsted equations and determine the equilibrium constants for the acid-base reactions that occur when aqueous solutions of the following are mixed.
how do you caclulate the theoretical yield? I began using 2.00 g of Salicylic acid, 5.0 mL of acetic anhydride, and added 5 gtts of concentrated sulfuric acid.
The chemical reaction that causes aluminum to corrode in air is given by 4Al+3O2 Al2O3 in which Hrxn = %3352 kJ rxn = %u2212625.1 J/K) What is the Gibbs free energy for this reaction at 5975K ?
How much heat is required to vaporize 55.0 of acetone at its boiling point? The heat of vaporization of acetone at its boiling point is 29.1.
how does a water softener work chemically? What's better to drink tap water or bottle springwater and why?
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