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What mass of sodium cyanide must be added to 250ml of water in order to obtain a solution having a pH of 10.50? Ka(HCN) = 4.9 x 10 ^-10
A sample of neon effuses from a container in 79 seconds. The same amount of an unknown noble gas requires 161 seconds.
The blood buffering system is aided by the enzyme carbonic anhydrase, which interconverts carbon dioxide and water to bicarbonate and H
A gas in a sealed container has a pressure of 125 kPa at a tempurature of 30.0 degrees celcius. If the pressure in the container is increased to 201 k Pa, what is the new tempurature?
Calculate the hydronium ion concentration and the pH after the addition of 0.25 mL of 0.10 M HCl to each one. What accounts for the difference in the hydronium ion concentrations
What is the pH of the saturated solution of Ca(OH)2 (Ksp = 1.3 x 10-6). 12.14 8.11 11.06 12.37 2. To a 1.00 L solution containing 1.00 x 10-3 mole each of Ca2+, Sr2+, and Ba2+, 0.0100 mole of Na2SO4 solid is added
An unknown metal with a mass of 28g absorbs 58J of heat. Its temperature rises from 31.1C to 39.9C. Calculate the heat capacity of the metal ?
How would the ground-state energy levels of X and H compare and would the energy of an electron in the n = 2 level of H be higher or lower than that of an electron in the n = 2 level of X? Explain your answer.
What is the percentage by mass of CH4 in the mixture. The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1, respectively.
A 25.0-mL sample of 0.35 M HCOOH is titrated with 0.20 M KOH. What is the pH of the solution after 25.0 mL of KOH has been added to the acid? Ka = 1.77 × 10-4
When Calcium Hydroxide is mixed with sodium phosphate, calcium phosphate precipitates out of solution. If 4.12 grams of calcium hydroxide is mixed with 5.02 grams of sodium phosphate in 500 mL of water
Draw a detailed mechanism for the formation of 1,4-di-t-butyl-2,5-dimethoxybezene from t-butyl alcohol.
Suggest reasons why recrystallization from water would probably not be suitable procedure for purifying
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