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A sol. of unknown Calcium concentration is titrated using EDTA. The EDTA is first standardized against a primary standard Zinc sol. prepared by dissolving 0.4088g of Zn in 1.000L of sol. A 20.00mL aliquot of the Zn sol. required 31.06 mL of EDTA sol. to titrate to endpoint. A 25.00mL aliquot of the calcium unknown required 46.77mL of the EDTA to titrate to endpoint. What is the molar concentration of calcium in the unknown sample?
As a separation and detection method, would TLC or paper chromatography yield better results in the analysis of each of the following pairs of compounds
Suppose 8.26 g of solid Mg(OH)2 is added to 36.1 mL of 0.488 M H2SO4 solution. What will the concentration of Mg2+ be when all of the acid has been neutralized. How many grams of Mg(OH)2 will not have dissolved.
If 1.06 moles of helium exert a pressure of 0.750 atm at 210 degrees Celius, what is the volume in milliliters
What is the sum of all coefficients in the complete and balanced net equation for the reaction occurring when chlorine gas is bubbled through aqueous sodium hydroxide to form aqueous sodium hypochlorite (NaOCl) and sodium chloride
the partial pressure of water vapor in an atmosphere at 35 degree celsius and 740 mm hg pressure is 37 mm hg. what is
The Coal is fed with 200% excess water ( excess is calculated with respect to CO formation) 100% of coal is consumed. the selectivity to CO (with respect to CO2) is 1:1 the functional conversion of the CO is 50% what is the final gas composition? ..
Calculate the intermolecular collision frequency and the mean free path in a sample of helium gas with a volume of 5.0 L at 27 degrees Celsius and 3.0 atm.
calculate the mass of KHP(KHC8H4O4) needed to react completely with 25 mL of a 0.10 M NaOH solution?
A liquid has a heat of vaporization of 30400 J/mol. At 271 K it has a vapor pressure of 102 mmHg. What is the normal boiling point of this liquid
Explain which of the following aqueous solutions has the strongest ion-dipole attractions: 0.3 M FeBr3, 0.6 M CaCl2, 0.5 M Ba(NO3)2, 0.2 M (NH4)2SO4, 0.9 M KOH
For the first-order reaction below, the initial concentration of A is 0.240 M. If the concentration of A decreases to 0.0800 M after 21.8 hours, what is the half-life of the reaction
molecules can be as small as a few atoms or as large as thousands of atoms. in 1962 max f. perutz and john c. kendrew
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