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Calcium in powdered milk is determined by ashing a 1.4983-g sample and then titrating thecalcium with EDTA solution, 12.13 mL being required. The EDTA was standardized bytitrating 10.00 mL of a zinc solution prepared by dissolving 0.5941-g zinc metal in acid anddilution to 1L in a volumetric flask (i.e. 1.0000 L). For the standardization titration, 10.82mL of EDTA was required. What is the weight % Ca in the powdered milk sample?Notes on procedure:1. Ashing burns off the organic matter in a sample, leaving just the mineral residue,which can then be dissolved for analysis.2. The stoichiometry of the complexation reactions between EDTA and calcium andEDTA and zinc is 1:1 in both cases.
Tell the number of hydrogens bonded to each carbon atom in (a) the anti-influenza agent oseltamivir, marketed as tamiflu, and (b) the platelet aggregation inhibitor clopidogrel, marketed as plavix. give the molecular formula of each.
The reaction is CaO(s) + H2O(l) ? Ca(OH)2(aq) -- ?H = -83.7 kJ Assume the heat capacity of the solution is the same as pure water (4.184 J/g*°C), the density of the solution is 1.00 g/mL and there is no loss of heat to the surroundings.
a solution of ammonia and water contains 3.20times1025 water molecules and 8.10times1024 ammonia molecules. how many
What is the oxidation half reaction, Reduction half reaction, and overall reaction for Chloride + permanganate --->
Current annual energy consumption in the United States is 99.3 quads. Assume that all this energy is to be generated by burning CH4(g) in the form of natural gas.
The unknown compound assigned to a student was an aldehyde, but about half of the sample distilled around 65, and the rest of it distilled near 155?. (a) What is the name of the aldehyde. (b) What else was in the sample and why. Write a balanced e..
What is the net ionic equation for a solution of calcium chloride and a solution of mercury (I) nitrate
What is the energy of photon required to cause the electron in a hyrogen atom to undergo a transition from n=2 state to the n=6 state
Consider the following data. 2 Ca(s) + O2(g) 2 CaO(s) H = -1270.2 kJ C(s) + O2(g) CO2(g) H = -393.5 kJ CaO(s) + CO2(g) CaCO3(s) H = -178.3 kJ Use Hess's law to calculate H for the reaction below.
The molar mass of a neutron is 1.008665 g/mol. Calculate the binding energy (in J/mol) of F-19. (c=2.998 x 10^8 m/s)
A gas at constant temperature occupies a volume of 4.59 L and exerts a pressure of 895 torr. What volume (in L) will the gas occupy at a pressure of 642 torr
What is the percent hydrogen (H) by weight of a solution containing 53.5 mL of CH3COCH3? The density of acetone is 0.788 g/mL.
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