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a 100 ml sample of hard water is titrated with the ETDA solution in problem 2. the volume of EDTA required to reach the end point is 22.44 ml
a. how many moles of EDTA are used i titration= 3.97x10^-4b. how many moles of Ca2+ ion are there in 100 ml water sample: 3.97x10^-4
c. if the Ca^2+ ion comes from CaCO3 how many moles of CaCO3 are there in 1 l of hard water. How many grams of CaCO3 per liter?
Draw the resonance contributors of pyrrole and the cyclopentadienyl anion to demonstrate that all atoms are sp2 hybridized.
Does your result agree with the measured overall rate law expression? If not, under what conditions would agreement be observed?
For the unbalanced equation _Al+_O2=_Al2O3. How many moles are needed to form 2.3 moles of aluminum oxide.
Silver consists of two major isotopes with the following percent abundances and atomic masses: 107Ag (51.84% and 106.90509 amu) and 109Ag (48.16% and 108.90476 amu). Calculate the average atomic mass of silver to five significant digits.
What mass of melamine, C3N3(NH2)3 will be obtained from 162.0 kg of urea, Co(NH2)2 if the yield overall reaction is 80%
Two solutions of an unknown slightly soluble salt, A(OH)2, were allowed to equilibriate- one at 25 degrees C, the other at 80 degrees C. A 15 mL aliquot of each solution is tiotrated with .200 M HCl. 8 mL of the acid is required to reach the endpo..
Three gases, nitrogen, helium, and krypton are confined in a 9.00 L vessel at a pressure of 7.00 atm. The vessel contains 5.00 moles of nitrogen, 2.00 moles of helium, and 2.00 moles of krypton. What is the partial pressure of helium
A solution contains 10.5 grams of unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16 degree Celisus.
Sodium-24 is used to treat leukemia and has a half-life of 15 hours. A patient is injected with a salt solution containing sodium-24. What percentage of the 24Na remained after 48 hours
In a particular biological reaction taking place in the body at 37°C, the change in enthalpy was --135 kJ mol--1 and the change in entropy was --136 J K--1 mol--1. (a) Calculate the change in Gibbs energy (b) Is the reaction spontaneous? (c) ..
Joe makes up a 0.1M solution of Potassium Fluoride. He uses a pH meter to test the pH of the solution. What is the most reasonable value he would find?
Would the following procedural errors cause an increase, a decrease, or no change in your calculated molecular weight? Indicate clearly the reasoning in each case.
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