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A certain indicator, HA, has a Ka value of 0.000040. The protonated form of the indicator is red and the ionized form is blue.What is the pKa of the indicator?
What is the color of this indicator in a solution with pH=6?
A solution contains 4.64g KCl in 178 mL of solution. The density of the KCl solution is 1.14 g/mL. What is the molarity,M, for the potassium chloride solution?
A sample of chlorine, which has an average atomic mass of 35.86, consists of two isotopes with mass of 35 and 37. What is the percent (to 0.1%) abundance of the 37 isotope?
If the total pressure is 1.8 atm, what is the partial pressure of ethanol?
Draw a complete lewis structure for the CONJUGATE ACID of Nitromethane (condensed formula CH3NOOH). Draw a complete lewis structure that shows all bonds, unshared electron pairs, and minimized formal charges where appropriate.
what speed would this quasar seem to be receding from us? Give your answer in km/s and as a fraction of the speed of light.
Given the following at 25°C and 1.00 atm: 1/2N2(g) + O2(g) ® NO2(g)DH0 = 33.2 kJ N2(g) + 2O2(g) ® N2O4(g)DH0 = 11.1 kJ Calculate the DH0 for the reaction below at 25°C. 2NO2(g) ® N2O4(g)
Calculate the enthalpy change for the reaction in kJ/mol HCL. For this problem, assume that the calorimeter loses only a negligible quantity of heat, the total volume of the solution is 100 ml, the density of the solution is 1.0 g/ml, and its spec..
You prepared a 0.250 M solution by diluting 8.45(+-0.04)mL of 28.0(+-0.5)mL wt.%NH3 (density=0.899(+-0.003)g/mL up to 500.0(+-0.2)mL. Find the uncertainty in 0.250 M.
Water boils at a much higher temperature than all other molecules of similar molecular weight because: it makes very strong hydrogen bonds
A sample of an element has a volume of 81 mL and a density of 1.73 g/mL. What is the mass in grams of the sample (round to the nearest tenth)?
In non-ionic compounds, the two primary sources of intermolecular forces are permanent dipoles and temporary dipoles. Explain what causes these types of dipoles to form.
Buffer solution will be prepared using (CH3)2NH2+ and (CH3)2NH conjugate acid/base pairs. To prepare the buffer, 50.0 mL of 0.084 M (CH3)2NH2+ (Ka = 1.68x10^-11) was mixed with 72.6 mL of 0.064 M KOH. Calculate the resulting pH of the solution.
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