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Chromium (iii) hydroxide Cr(OH)3 is highly insoluble in distilled water but dissolves readily in either acidic or basic solution. Briefly explain why the compound can dissolve in acidic or in basic but not neutral solution. Write appropriate equation to support your answer.
Determine if the sample has non-volatile impurities (dissolved in it) b. If found to contain such impurities, determine a suitable method for its purification
According to Hund's Rule, how many unpaired electrons are in the valence shell of element 10?
A solution contains 0.021 M Cl? and 0.017 M I?. A solution containing copper (I) ions is added to selectively precipitate one of the ions. At what concentration of copper (I) ion will a precipitate begin to form? What is the identity of t..
Calculate the range of pH values for which Mg(OH)2 will not precipitate but Fe(OH)3 will. Assume the solution is 0.0500 M
The molal freezing point constant for water is 1.86 C/m. At what temperature will a mixture of 2.00 g of CaCl2(MM: 110.98g/mol) and 25.00 g of water freeze
A certain weak acid, HA, is titrated with Ka 5.61x10^-6 naoh. More strong base is added until the equivalence point is reached. What is the pH of this solution at the equivalence point if the total volume is 56.0
at 400 K, the rate of decomposition of a gaseous compound initially at a pressure of 12.6 kPa, was 9.71 Pa/s when 10.0 % had reacted and 7.67 Pa when 20.0 % had reacted.Determine the order of reaction.
(a) Given that the molar mass of H3PO4 is 97.994 grams, determine the number of grams of H3PO4 needed to prepare 0.35L of a 1.25M H3PO4 solution. (b) What volume, in Liters, of a 1.25 M H3PO4 solution can be prepared by diluting 50 mL of a 4.5M H3..
Caffeine has a distribution of 4.6 between water and dichloromethane. Calculate how much caffeine (I used 0.5283g of caffeine) is extracted per each 6ml dichloromethane extraction.
A 1.25 g sample of dry ice is added to a 765 mL flask containing nitrogen gas at a temperature of 25.0 C and a pressure of 715 mm Hg. The dry ice is allowed to sublime (convert from solid to gas) and the mixture is allowed to return to 25.0 C. Wha..
if 20. g or NaCl are used and only 5.6 g of HCl are isolated, what is the percent yield of HCl C.) If only 5.6 g of HCl are obtained, how many grams of Na2SO4 must also have been formed
A solar panel is used to heat water in a tank. How much heat energy is needed to raise the temperature of 1000 L of water from an initial temp of 23 degrees Celsius to a final temp of 65 degrees Celsius
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