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(a) A 0.5872-gram sample of potassium hydrogen phthalate (KHC8H4O4) is dissolved in 50.0 mL of solution. What is the molarity of this solution?
(b) The entire solution of "KHP" (abbreviation for "potassium hydrogen phthalate") is titrated with sodium hyroxide solution which concentration is unknown, using phenolphthalein as the indicator 22.90 mL of NaOH solution is used to reach end-point, determine the molar concentration of NaOH.
(c) The same NaOH solution is then used to titrate a 10.00-mL sample of sulfuric acid (H2SO4) of unknown concentration, which requires 25.80 mL of the base to neutraize the sulfuric acid. What is the molarity of H2SO4? The acid base reactions that occur during the two titrations are as follows: (i) KHC8H4O4(aq) + NaOH(aq)--->NaKC8H4O4(aq) + H2O(l); (ii) H2SO4(aq) + 2NaOH(aq)--->Na2SO4(aq) + 2H2O(l)
Phosphate can buffer in three pH ranges. Give the chemical formulas of the buffer pairs and give the range in which each buffers. Start with H3PO4/ H2PO4-1
Calculate the pH of an aqueous solution that is 0.020 M in HNO3 (aq) at 25 degrees Celcius. Is the solution acidic or basic
How many grams of sodium azide are needed to fill a 30*30*25cm bag to a pressure of 1.30atm at 21.0C?2NaN3=3Na+2N2
The air in an inflated balloon (defined as the system) warms over a toaster and absorbs 121 J of heat. As it expands, it does 70. kJ of work. What is the change in internal energy for the system.
Given the reaction 6CO2+6H2O-> C6H12O6+6O2. What is the total number of moles of water needed to make 2.5 moles of C6H12O6?
When 5.00 g of fructose, C6H12O6, (FW 180.16 g/mol) is burned in a calorimeter whose heat capacity is 29.7 kJ/oK, the temperature increases by 2.635oK. Calculate the heat of combustion of fructose in kJ per mole.
Identify the product of the nuclear reaction by providing its atomic number symbol, mass number, and atomic number.
If gasoline's composition is estimated to be 50% octane, 25% pentane and 25% ethly benzene on a mol basis, calculate the mols of oxygen required per mol of fuel for complete combustion.
Calculate the enthalpy of the reaction: 2NO(g) + O2(g) --> 2NO2(g) given the following reactions and enthalpies of formation: 1/2 N2(g) + O2(g) --> NO2(g), delta H *A = 33.2 kJ 1/2 N2(g) + 1/2O2(g) --> NO(g), delta H *B= 90.2 kJ
The volume percentage of CO2 in a mixture of that gas with N2 was determined by bubbling the mixture at 1.00 atm and 25*C through a solution of 0.0100 M NaHCO3 and measuring the pH.
a student collects 31.8 mL of argon gas at a temperature of 21 Celsius and a pressure of 755 mmHg. What is the volume of argon at STP?
Descibe at least four possible factors which may influence the amount of light absorbed by a solution and how these factors may affect the absorption
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