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The pH of a calcium containing solution is adjusted by the additionof a few drops 0f 2M KOH and titrated with 0.01000M EDTA. If a10.00 ml aliquot of the Ca2+ containing solution requires 15.40 ml of the EDTA to reach the equivalence point. What is the concentration of Ca2+ with in the unknown sample?
The space shuttle environmental control system handles excess CO2 (it is 4.0% by mass of exhaled air) by reacting it with LiOH, pellets to form Li2CO3 and water. If there are 7 astronauts on board ad each exhales 20.L of air per minute
What is the pH of a solution prepared with 25 ml of 0.134 sodium acetate and 25 ml of 0.200 M of acetic acid
For a particular reaction it was found that the reaction rate was 16 times faster at 35oC than it was at 25oC. It was also found that the equilibrium constant at 25oC was four times bigger than it was at 35oC.
1. my doctor only measures medicine in scruples. (old unit of mass) If he prescribed 0.382 scruples of medicine, how many milligrams should I ask for at the pharmacy? 1ounce=437.5 grains 1 scruple=20 grains 1ounce=28.35
You are given the chemical reaction (unbalanced equation): AsF3 + C2Cl6 AsCl3 + C2Cl2F4, if 1.3618 mol of AsF3 are allowed to react with 1.000 mol of C2Cl6, what would be the theoretical yield of C2Cl2F4, in grams?
Calculate the enthalpy change, Delta H, for the process in which 32.6 g of water is converted from liquid at 1.2 C to vapor at 25.0 C. For water, H = 44.0 kJ/mol at 25.0 C and s = 4.18J/g C for H2O(l)
A shiny piece of metal is beleved to be either platinum or nickel. if the price has a mass of 156.485g and a volume of 7.31 ml, calculate its density and decide which elemnt it is made of. The density of Ni is 8.9 g/ml, pt is 21.4 g/ml
When 0.75 g of Mg(s) is reacted with excess HCl(aq) in a calorimeter of total heat capacity (container plus contents) of 550.0 J/ºC, what is the expected temperature change ?T?
You intend to monitor the diffusion using a camera that is capable of one image every 60 s. Is this imaging rate of the camera sufficent to detect the diffusion of a single lysozyne protein over a length of 1μm
How To Draw a Free Electron Model Energy Level Scheme for Hexatriene, give correct energy assignment and quantum number and include correct spin
Calculate [H+], pH, [OH-] and pOH in a solution in which lactic acid, HC3H5O3, concentration is 0.250 M and the lactate ion concentration is 0.125 M.
During a balloon ascension, wearing an oxygen mask, you measure the weight of a calibrated 5.00-kg mass and find that the value of the gravitational field strength at your location is 9.785 N/kg.
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