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To simulate the pH of blood, which is 7.4, an undergraduate researcher in a biology lab produced a buffer solution by dissolving sodium dihydrogen phosphate (Ka = 6.2 × 10-8) and sodium hydrogen phosphate (Ka = 3.6 × 10-13) together in an aqueous solution. What mole ratio of Na2HPO4/NaH2PO4 did she need to use?
Arrange the following molecules in the expected order of increasing boiling points: carbon tetrabromide, CBr4; butane, CH3CH2CH2CH3; fluorine, F2
If a piece of aluminum with mass 3.90 g and a temperature of 99.3 degrees celcius is dropped into 10.0 cm cubed of water at 22.6 degrees celcius, what will be the final temperature of the system?
If the diameter of a sodium atom is 3.14×10-8 cm, how many sodium atoms would fit along a line exactly 6.00 inch long?
The volume of a sample of gas, initially at 25oC, increase from 158 ml to 450 ml. What is the final temperature (C) if the pressure in the container is kept constant.
1.00 moles of sucrose (C12H22O11), and 1.20 moles of glucose. Sucrose and glucose are nonvolatile. What is the mole fraction of water in this solution?
A volume of 60.0 mL of aqueous potassium hydroxide(KOH)was titrated against a standard solution of sulfuric acid(H2SO4). What was the molarity of the KOH solution if 24.7 mL of 1.50M H2SO4 was needed? The equation is: 2KOH(aq)+H2SO4(aq)-->K2SO4(aq..
If the total pressure in the cylinder is 2490 mmHg, what is the partial pressure of each of the components? Assume constant temperature.
Hydrogenation of carbon double bonds C=C (i.e. adding a hydrogen on each carbon atom and thus reducing the double bond into a single bond: H-C-C-H) is a very common process in organic and polymer chemistry
The reported values for one compound (CaHbOc) were as follows: mass: 214.1360 g/mol; percent C and H: 84.07 and 8.47, respectively. Determine the molecular formula of the compound.
Derive explicitly equations for number and weight average molecular weight in a linear polycondensation reaction of A-B type monomers.
Explain why it is appropiate to group a polyatomic ion in parenthses in a chemical formula, if more than one of that ion is present in the formula.
A 5.00 % m/m glucose solution has d = 1.02 g/mL. What is the mass of glucose in 362 mL of the solution.
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